Keiji Mutoh

On February 19, 2020 Muto made an appearance at the Tiger Hattori Retirement Show, appearing alongside fellow NJPW alumni Riki Choshu, The Great Kabuki, and Hiroshi Hase.

Muto, in his Great Muta persona, was the last entrant in the ROH/NJPW Rumble at the G1 Supercard Show on April 6, 2019. This marked his first appearance for the promotion in 5 years.

Muto appears as a gang member in the 2017 video game Yakuza Kiwami 2, alongside Genichiro Tenryu, Masahiro Chono, Riki Choshu and Tatsumi Fujinami.

Muto was the owner and founder of Wrestle-1 (W-1) (formed in 2013;defunct in 2020), where he also wrestled semi-regularly; Muto previously made special appearances for American promotion Total Nonstop Action Wrestling (TNA) as part of the TNA/W-1 talent exchange partnership. Between W-1, AJPW, NJPW, and World Championship Wrestling (WCW), Muto has held a total of 22 championships.

On June 1, Muto returned to the United States to make an appearance for Pro Wrestling Syndicate (PWS) in Rahway, New Jersey, teaming with Kai to defeat Anthony Nese and Sami Callihan in a tag team match. In November 2012, Muto and his business partners sold all of their All Japan shares to the Speed Partners corporation for ¥200 million. On June 1, 2013, Speed Partners president Nobuo Shiraishi took over as the new president of All Japan, firing the previous president, Muto's longtime right-hand man Masayuki Uchida, in the process, which led to Muto resigning from the promotion, effective June 30, 2013.

On July 10, 2013, Muto announced the foundation of a promotion named Wrestle-1, bringing over many of the former wrestlers of All Japan Pro-Wrestling that left in June. At the promotion's inaugural event on September 8, Muto teamed with Bob Sapp in a main event tag team match, where they defeated René Duprée and Zodiac. During Wrestle-1's second show on September 15, Muto made his first Japanese appearance as The Great Muta in two years, when he and Tajiri defeated Duprée and Zodiac in a tag team match. On October 18, Muto announced his semi-retirement, saying that in the future he would only work Wrestle-1's larger events. On March 2, 2014, Muto put his career on the line at Kaisen: Outbreak, Wrestle-1's first event in Ryōgoku Kokugikan. Muto teamed with Rob Terry and the debuting Taiyō Kea in a six-man tag team match, where they defeated Masayuki Kono, René Duprée and Samoa Joe, thus saving his career. Through Wrestle-1's working relationship with TNA, Muto, working under his Great Muta persona, returned to the American promotion on March 9 at Lockdown, where he, Sanada and Yasu defeated Chris Sabin, Christopher Daniels and Kazarian in a six-man tag team steel cage match. Muta returned to TNA on the July 25, 2014, defeating Robbie E at an Impact Wrestling taping in New York City. After the match, Sanada turned on Muta. This led to a match at Wrestle-1's Shōgeki: Impact event on July 6, where The Great Muta defeated Sanada in a main event singles match. On September 22, Muto suffered his first direct loss since March 2012, when he was submitted by Masayuki Kono in a four-on-three handicap match, where he and the Novus stable (Jiro Kuroshio, Koji Doi and Rionne Fujiwara) faced the Desperado stable (Kono, Kazma Sakamoto and Ryoji Sai). On October 12, Muto, as the Great Muta, worked TNA's Bound for Glory event in Tokyo, teaming with Tajiri in a tag team main event, where they defeated James Storm and The Great Sanada. On November 1, during an event celebrating his 30th anniversary in professional wrestling, Muto defeated Masayuki Kono to become the second Wrestle-1 Champion. He made his first successful title defense on December 22 against Seiya Sanada. His second defense took place on January 30, 2015, when he defeated Manabu Soya. On February 16, Muto, as the Great Muta, returned to TNA, defeating Mr. Anderson as part of Global Impact: USA vs The World. On March 8, Muto lost the Wrestle-1 Championship to Kai in his third defense. On March 27, 2017, Muto announced he was stepping down as the president of Wrestle-1 with Kaz Hayashi taking over the position. Muto remained with the promotion as its representative director. On June 8, 2019, Muto returned to Impact Wrestling, wrestling as The Great Muta in the main event of their A Night You Can't Mist event in a tag team match where he teamed with Tommy Dreamer to defeat Michael Elgin and Johnny Impact. On April 1, 2020 at Wrestle-1's final event, Muto team with Kaz Hayashi, Masayuki Kono, and Shuji Kondo unsuccessfully against Kuma Arashi, Shotaro Ashino, Daiki Inaba, and Koji Doi.

On January 4, 2012, Muto made a return to New Japan at Wrestle Kingdom VI in Tokyo Dome, where he defeated Tetsuya Naito in a singles match. A year later at Wrestle Kingdom 7 in Tokyo Dome, Muto teamed with Shinjiro Otani, a replacement for an injured Daichi Hashimoto, in a tag team match, where they were defeated by Hiroyoshi Tenzan and Satoshi Kojima. Muto returned to New Japan again a year later at Wrestle Kingdom 8 in Tokyo Dome, now working as The Great Muta in a tag team match, where he and Toru Yano defeated Suzuki-gun (Minoru Suzuki and Shelton X Benjamin). As the only face in the match, Muta turned on Yano towards the end of the match, but his green mist accidentally hit Suzuki instead, leading to Yano pinning him for the win.

Muto would win the junior heavyweight and heavyweight battle royals at the Korakuen Hall on January 1 and 3, 2011, respectively. At Pro-Wrestling Love In Ryogoku Vol. 12, Muto and KENSO defeated SMOP (Akebono and Ryota Hama) to win the World Tag Team Championship, marking Muto's fifth and final reign with the title. At All Together, Muto teamed with Kenta Kobashi to defeat Takashi Iizuka and Toru Yano in a tag team match. On October 23, Muto and KENSO lost the World Tag Team Championship to Dark Cuervo and Dark Ozz, thus ending Mutoh's final championship reign in All Japan.

On June 7, 2011, Muto announced his resignation as the president of All Japan Pro Wrestling, remaining in the promotion as an active wrestler and a member of the Supervisory Board. Muto's decision stemmed from a real-life incident where Yoshikazu Taru assaulted Nobukazu Hirai backstage at an All Japan Pro Wrestling show, which led to Hirai suffering a stroke after competing in a match. Muto took the blame for the incident, which led to All Japan suspending not only Taru, but also Kazuhiko Masada, Masayuki Kono and Minoru Tanaka who were present when the attack took place. After being on the midcard and without a big feud for most of 2011, Muto became the main challenger for NOAH's Jun Akiyama, who had won the Triple Crown Championship from Suwama. Muto reunited with Kenta Kobashi at All Together to defeat Akiyama and Takao Omori. Akiyama challenged Muto to a match for the title that took place on March 20, 2012, which Muto eventually lost.

The 2009 Real World Tag League win earned Muto and Masakatsu Funaki, a title match for the World Tag Team Championship against Minoru Suzuki and Taiyo Kea on January 3, 2010, which Muto and Funaki won. On January 30, Muto, under his Great Muta gimmick, made a special appearance for Pro Wrestling Guerrilla in Los Angeles, California, during the WrestleReunion 4 weekend, teaming up with Kai in a match, where they defeated the team of Joey Ryan and Scott Lost. On March 9, Muto and Funaki were forced to vacate the titles due to Muto going through a reconstructive knee surgery that kept him out of the ring for the rest of the year. Muto returned to All Japan as Great Muta at Pro-Wrestling Love in Ryogoku Vol.10 in August, where he lost to Kenso in a Tables, Ladders and Chairs match. On September 10, Muto faced his former tag team partner Masakatsu Funaki in a special return match, which ended in a thirty-minute time limit draw. On October 24, Muto unsuccessfully challenged Kaz Hayashi for the World Junior Heavyweight Championship. On December 12, Muto and Kannazuki lost the F-1 Tag Team Championship to Ryota Hama and Koriki Choshu after a four-year reign.

In 2009, Muto took part in a tournament for the vacant All Asia Tag Team Championship by teaming with Kaz Hayashi, defeating Ryota Hama and Shuji Kondo in the quarter-final before losing to Minoru Suzuki and Nosawa Rongai in the semi-final. On March 14, Muto defended his Triple Crown Heavyweight Championship against Yoshihiro Takayama. He bloodied him severely, as is his trademark, and even used the Shining Wizard to his opponent on the barricade. During the course of the match, however, his mask was ripped off, and he was bleeding profusely. Towards the end of the match, Takayama dominated Muta, but Muta reversed a kick into a Dragon Screw, and attempted to use the Asian Mist against him, but Takayama blocked it, and performed an Everest Suplex Pin on Muta, and won the match. Muta subsequently walked away in shock of what had happened.

Following the title loss, Muto participated in the 2009 Champion Carnival, where he won four out of five matches in his block, losing only to Kaz Hayashi. As a result, Muto advanced to the semi-final of the tournament, where he lost to Minoru Suzuki. Muto would spent the entire year representing All Japan in matches against Voodoo Murders, Tokyo Gurentai and F4. In November, Muto teamed with Masakatsu Funaki to participate in the 2009 Real World Tag League. The duo won the tournament by defeating Masayuki Kono and Suwama.

In the fall of the year, Muto and his partner Joe Doering participated in the 2007 Real World Tag League, which they won by defeating Satoshi Kojima and Suwama in the final on December 9. This earned them a title shot for the World Tag Team Championship against Kojima and TARU on January 3, 2008, which Muto and Doering won. In April, Muto entered the 2008 Champion Carnival, winning only two matches and failing to advance in the round robin stage. Muto and Doering lost the World Tag Team Championship to Minoru Suzuki and Taiyo Kea after a five-month reign on June 28.

Muto had won the IWGP Heavyweight Championship in NJPW earlier in 2008 and successfully defended the title in All Japan against Hirooki Goto at Pro-Wrestling Love in Ryogoku Vol. 5. On September 29, Muto wrestled as The Great Muta as he defeated Suwama to capture the Triple Crown Heavyweight Championship for the third time, becoming only the second wrestler, after Satoshi Kojima, to hold the Triple Crown Heavyweight Championship and the IWGP Heavyweight Championship at the same time. Muta successfully defended the title against Minoru Suzuki at Pro-Wrestling Love in Ryogoku Vol. 6. Muto closed out the year with an unsuccessful stint in the 2008 Real World Tag League alongside Ryota Hama.

On January 4, 2008, at Wrestle Kingdom II in Tokyo Dome, under the Great Muta persona, he defeated Hirooki Goto. On April 27, Muto defeated Shinsuke Nakamura to win his fourth IWGP Heavyweight Championship, this was his second appearance in 2008 for NJPW and he had not held the title for eight years and four months prior to the win. After retaining the title against Manabu Nakanishi and Togi Makabe, Muta defended the title against former champion Shinsuke Nakamura at Destruction on October 13 and retained following a Frankensteiner. He would lose the title to his former student Hiroshi Tanahashi at Wrestle Kingdom III on January 4, 2009 after Tanahashi used his signature High Fly Flow twice to get the pin. After the match, Muto said backstage that he had passed Tanahashi his sash after doing his best for over half a year to raise the worth of the title, and suggested that he would withdraw and leave New Japan to move their company forward. Muto would make his second appear in NJPW on October 12 to commemorate Masahiro Chono's twenty-fifth year in professional wrestling as Muto teamed with Chono and Kenta Kobashi to defeat Jun Akiyama, Manabu Nakanishi and Satoshi Kojima in a six-man tag team match.

He made his British debut on January 12, 2007, wrestling for Real Quality Wrestling at the York Hall in Bethnal Green, London, England, where he defeated RQW Heavyweight Champion Martin Stone in a non-title match. On February 17, Muto competed as Great Muta for a special tag team match in which he teamed with Tajiri to defeat Goldustin and Hakushi. In March, Muto participated in the 2007 Champion Carnival, competing in Block A and finishing with 6 points total; Muto defeated Toshiaki Kawada in the finals on March 30, winning the tournament for a third time. Around that time, while Muto was in Orlando, Florida, in order to establish a working agreement between All Japan and Total Nonstop Action Wrestling (TNA), he made an appearance for the company, under his Great Muta gimmick, at the Destination X pay-per-view, in a segment with Christian Cage. In February 2009 Muto was featured in multiple interview segments, taped in Japan, where he spoke of his student Akira Raijin, who had just begun working for TNA. At Pro-Wrestling Love In Yokohama, Muto unsuccessfully challenged Minoru Suzuki for the Triple Crown Heavyweight Championship.

He then appeared at Wrestle Kingdom I in 2007 where he reunited with former partner and rival Masahiro Chono to defeat Tencozy in a "Super Dream Tag match" pitting NJPW and AJPW wrestlers together.

On March 10, 2006, Muto revived his Great Muta moniker as he unsuccessfully challenged Satoshi Kojima for the Triple Crown Heavyweight Championship. Muto failed in the 2006 Champion Carnival and continued his feud with Voodoo Murders throughout the year. At the end of the year, Muto was paired with Toshiaki Kawada in the 2006 Real World Tag League, where they tied Satoshi Kojima and Hiroyoshi Tenzan with eight points in the round robin stage, which led to a match between the two teams on December 2 to determine the final round opponents for the top-ranked team in the tournament, RO'Z and Suwama. Muto and Kawada lost their match. On December 15, Muto teamed with Kannazuki to defeat Hiroyoshi Tenzan and Akimasa Haraguchi to become the inaugural F-1 Tag Team Champions.

In 2006, he appeared as a guest star in the Japanese historical drama series Saiyūki, playing a village headman who is helped by Son Gokū (played by Shingo Katori).

Shortly after his title loss, Muto entered the 2003 Champion Carnival, defeating John Tenta in the quarter-final but lost to Arashi in the semi-final. On June 8, Muto teamed with Arashi to participate in a tournament for the vacant World Tag Team Championship, which they won by defeating Gigantes and The Gladiator in the semi-final and Jimmy Yang and Satoshi Kojima in the final. On July 13, Muto failed to become the #1 contender for the Triple Crown Heavyweight Championship by losing to Toshiaki Kawada. After successfully defending the tag team titles, Muto and Arashi entered the Real World Tag League but they failed to advance in the tournament. On December 27, Muto made a return to the United States, wrestling for the Ring of Honor promotion as part of an interpromotional All Japan vs. ROH card, which hosted a series of cross-promotional "dream" matches. In the main event, Muto reverted to his Great Muta persona and teamed with Arashi to defeat Prophecy members Christopher Daniels and Dan Maff. Muto and Arashi finally lost the tag titles to Kaz Hayashi and Satoshi Kojima on January 18, 2004.

Muto returned to NJPW as a member of the All Japan roster at Wrestling World on January 4, 2004, to team with Bob Sapp to defeat Cho-Ten. Muto next appeared at Pro-Wrestlers Be Strongest by teaming with Osamu Nishimura in a loss to Hiroshi Tanahashi and Shinsuke Nakamura. Muto would wrestle only one match for NJPW in 2005 at Nexess VI, where he defeated Ron Waterman.

In 2004, he played the role of Harold Sakata in the movie Rikidōzan, a film based on the real-life story of a wrestler who would eventually be known as the "Father of Puroresu"; Harold Sakata took Rikidozan under his wing and introduced him into the world of professional wrestling.

At Royal Road 30 Giant Battle In Budokan Final Battle on October 27, Muto under his Great Muta moniker, defeated Genichiro Tenryu to win his second Triple Crown Heavyweight Championship. The following month, he lost to Bob Sapp in a non-title match at Wrestle-1. Muto then entered the Real World Tag League alongside Animal Warrior but failed to advance in the tournament. Muta successfully defended the title against The Gladiator in his first title defense on January 13, 2003. On January 19, Muto teamed with Goldberg to defeat KroniK in a tag team match, which led to KroniK being injured in the match and being forced to retire. On February 23, Muta lost the Triple Crown Heavyweight Championship to Shinya Hashimoto.

Muto would then support AJPW in its feud with Roughly Obsess and Destroy and spent most part of the fall of 2003 and 2004 by competing in several matches against RO&D members. Muto found success in 2004 by entering that year's Champion Carnival, which he won by defeating Takao Omori in the semi-final and Kensuke Sasaki in the final on April 20. Muto picked up a major win against Osamu Nishimura at Battle Banquet. In November, Muto teamed with Nishimura to participate in the 2004 Real World Tag League but could not advance in their block. In 2005, Muto defeated his pupil Hiroshi Tanahashi of NJPW at Realize. On July 26, Muto received a title shot against Satoshi Kojima for the Triple Crown Heavyweight Championship but failed to win the title. While continuing to feud with RO&D, Muto and his supporters from the AJPW roster also began feuding with the Voodoo Murders. In November, Muto teamed with Akebono as they entered the 2005 Real World Tag League, making it to the final against Team 3D, which they lost.

Muto wrestled his last match as a member of the New Japan roster at Wrestling World on January 4, 2002, where he alongside his teammate Hiroshi Hase defeated Osamu Nishimura and Tatsumi Fujinami. Muto would then defect full-time to All Japan, which led to him and Kea being stripped off the IWGP Tag Team Championship on February 2.

On January 11, 2002, following the end of a year-long cross-promotional angle with New Japan Pro-Wrestling, Keiji Muto shocked the Japanese wrestling world by defecting to All-Japan as a full-time competitor, taking Satoshi Kojima and Kendo Kashin with him. In his first match as an AJPW contracted wrestler, Muto and Taiyo Kea successfully defended the World Tag Team Championship against Mike Barton and Jim Steele on January 14. Muto would then lose the Triple Crown Heavyweight Championship to Toshiaki Kawada on February 24. In April, Muto participated in the 2002 Champion Carnival, where he lost only two matches in his block while winning the rest of his matches and thus advancing to the knockout stage on April 10, where he defeated Satoshi Kojima in the semi-final and Mike Barton in the final to win the tournament. Three days later, at Grand Champion Carnival, Muto faced Genichiro Tenryu in a match for the vacant Triple Crown Heavyweight Championship after Kawada was forced to vacate the title due to injury. Muto lost the match. The following month, on May 12, Muto teamed with George Hines and Kaz Hayashi as the trio won the Giant Baba Six-Man Cup tournament. On July 17, Muto and Kea lost the World Tag Team Championship to KroniK.

After a planned tag team match with FMW's Hayabusa for Wrestling World 2001 was cancelled due to Hayabusa's injury to both his elbows that required reconstructive surgery, it seemed as if Muto reached a confusing crossroads in his career; however, he chose to completely change his image, shaving his head bald (he had a pronounced receding hairline throughout much of 2000), growing out a goatee, and aligning himself with a fellow NJPW wrestler who had gone overseas for an extended period of time, Shinjiro Otani. The two returned to New Japan on January 4, 2001, at Wrestling World, making short work of Manabu Nakanishi and Jushin Liger. Shortly after, Muto also began appearing for All Japan Pro Wrestling, where he debuted at King's Road New Century by defeating Taiyō Kea. On March 18, Muto debuted his new trademark move, the Shining Wizard to defeat Kazunari Murakami. Since its creation, it has become an extremely popular move on both sides of the Pacific, used by Muto's allies, rivals, and fans of his work. Muto would frequently begin appearing in both New Japan and All Japan, which led to Muto creating a new stable with Don Frye and Shinjiro Otani which later came to be known as BATT (Bad Ass Translate Trading). Added to their ranks were Taiyō Kea of All Japan Pro Wrestling and Jinsei Shinzaki of Michinoku Pro Wrestling. Muto defeated AJPW's veteran Toshiaki Kawada in a dream match at Champion Carnival One Night Special on April 14. At Super Force Group Declaration, Muto defeated Hiroshi Hase, then a member of All Japan, which led to Hase joining BATT as well.

2001 proved to be Muto's year of renewal besides the formation of a new unit, as he challenged, and defeated Genichiro Tenryu for All Japan's coveted Triple Crown Heavyweight Championship on June 8. Muto successfully defended the title against Steve Williams in his first title defense on July 14. Muto would then enter the 2001 G1 Climax, where he won all matches in his block, with the exception of a loss to Satoshi Kojima, thus qualifying for the semi-final on August 11, in which he defeated Tadao Yasuda and then lost to Yuji Nagata in the final a day later. Muto would then defend the Triple Crown Heavyweight Championship for the first time in New Japan against Scott Hall on September 23, which Muto retained. Muto and Hase would then lose to Yuji Nagata and Jun Akiyama at Indicate of Next.

In August, Muto entered the G1 Climax, where he lost only one match to Tatsumi Fujinami while winning the rest of his matches in the block thus qualifying to the final against Manabu Nakanishi, which he lost, leading to a match between Muto and Nakanishi for the IWGP Heavyweight Championship at Final Dome, where Muto retained. Muto revived Great Muta character at Jingu Climax on August 28 for a No Rope Explosive Barbed Wire Barricade Explosive Land Mine Double Hell Deathmatch against Great Nita, which Muta won. The following month, Muto entered the Super Grade Tag League with stablemate Scott Norton, which they won by defeating Manabu Nakanishi and Yuji Nagata in the final. On December 10, Muto finally lost the IWGP Heavyweight Championship to Genichiro Tenryu. The war between Chono and Muto was lost by Muto at the 2000 Wrestling World event as he was defeated by Chono. Muto took an extended hiatus to rehabilitate his damaged knees after that, focusing instead on one last run in America for WCW, thus marking the dissolution of nWo Japan as it merged into Chono's Team 2000.

After suffering a knee injury in early 2000, Muto took a hiatus from NJPW and returned to WCW in mid-2000 to team with Vampiro. Due to the bad booking and the decline of WCW in its last years, however, Muto could not recapture the previous popularity he had in the late 1980s and early 1990s. He returned to television on the July 11, 2000, episode of WCW Thunder and teamed with The Jung Dragons against Three Count and Tank Abbott. A week later he appeared on Nitro, defeating Vampiro in the quarterfinals of the United States Heavyweight Championship tournament. Later that night he was pinned by Mike Awesome in the semifinals. He won the WCW World Tag-Team Championship with Vampiro at New Blood Rising against KroniK. They lost it the next night on Nitro against the team of Rey Mysterio and Juventud Guerrera. His last WCW match came at a house show on September 23, 2000, in Lubbock, TX against Sting.

At Wrestling World on January 4, 1999, Muto defeated one of Chono's right-hand men, Scott Norton to win his third IWGP Heavyweight Championship. The following month, Masahiro Chono returned to NJPW and disagreed with Muto over Muto's philosophy and leadership of the nWo Japan, thus leaving the group and Muto feuded with Chono for the name of the nWo, which evolved into a war between the nWo, led by Muto, Hiroyoshi Tenzan, and Satoshi Kojima and Chono's new Team 2000 unit, with himself, Don Frye, Super J, and others from the old generation of the nWo. Muto successfully defended the IWGP Heavyweight Championship against Kensuke Sasaki at St. Valentine's Day Massacre, Team 2000 member Don Frye at Strong Style Symphony, Genichiro Tenryu on May 5 and Satoshi Kojima on July 20.

On January 4, 1998, Muto headlined Final Power Hall in Tokyo Dome as he unsuccessfully challenged Kensuke Sasaki for the IWGP Heavyweight Championship. Muto and Chono were forced to vacate the IWGP Tag Team Championship on April 21, when Muto injured his knees, as his years of using the moonsault press were finally catching up to him. During this time, he took a hiatus from action, returning just before the 1998 G1 Climax, from which he was eliminated by Genichiro Tenryu in the first round. Despite his return, Muto was plagued by this nagging injury, fighting through his pain throughout the rest of 1998 and all of 1999. Towards the end of 1998, Muto took the leadership of nWo Japan, after Chono suffered a neck injury and was out of action, turning the nWo into a face stable. Muto would then team with teammate Satoshi Kojima as they won the Super Grade Tag League by defeating Shinya Hashimoto and Tatsumi Fujinami in the final on December 6.

The latter half of 1996 had Muto pitted against Masahiro Chono's Ookami Gundan, which eventually blossomed into a war with the Chono-led nWo Japan. In the process, Muto began teasing at a possible turn to the side of the nWo, proclaiming himself to be the true successor to Antonio Inoki's legacy, and "accidentally" attacking his own partners in the middle of a match. During this period, Muto underwent a long slump in big matches, losing not only to members of the nWo, but fellow New Japan wrestlers including Power Warrior at Wrestling World on January 4, 1997, and Shinya Hashimoto for the IWGP Heavyweight Championship on June 5. The turn was teased many times. Muto would even wear an nWo shirt only to proclaim days later that he refused to join Chono's army. Muto further raised confusion by playing both sides of the feud; fighting as a member of New Japan under his real name, and as The Great Muta in nWo Japan, before being The Great Muta full-time for several months in 1997. The full turn came in September 1997, when Muto, after teasing a turn on his nWo teammates, double-crossed Kensuke Sasaki and Kazuo Yamazaki, sealing away the Muta name and formally joining nWo Japan as himself. Almost immediately following this, he and Chono dominated the tag team scene in NJPW, defeating Yamazaki and Sasaki for their second IWGP Tag Team Championship reign as a duo on October 19, and spray-painting the plates of the belts black as a show of disrespect for the championship's legacy. They continued their dominance in the tag team division by winning the Super Grade Tag League by defeating Manabu Nakanishi and Shinya Hashimoto in the final on December 8.

On February 3, Muto lost to Scott Norton in a #1 contender's match for the IWGP Heavyweight Championship. However, Muto received an opportunity for the title against Shinya Hashimoto at Wrestling Dontaku on May 3, where he defeated Hashimoto to capture his second IWGP Heavyweight Championship and subsequently vacated the IWGP Tag Team Championship three days later on May 6 to focus on defending the IWGP Heavyweight Championship. Muto successfully defended the title against Hiroyoshi Tenzan on June 14 and Hawk Warrior on July 13, before winning the G1 Climax in August, beating Hashimoto in the finals to become the first of two men to win the G1 Climax as IWGP Heavyweight Champion as Kensuke Sasaki would achieve this feat in 2000. Muto held the IWGP title throughout the rest of the year. On September 25, Muto successfully defended the title against Junji Hirata. He would then lead New Japan in the opening battles of the feud with Nobuhiko Takada and the UWF-i army, defeating Takada in his fourth title defense on October 9. Muto closed the year with his fifth successful title defense against Shiro Koshinaka on December 11. Muto finally lost the title to Takada at Wrestling World on January 4, 1996.

In 1995, Muto starred in the Japanese thriller Yajuu Densetsu: Dragon Blue, as Ryusaki, a suave detective who joins forces with a beautiful young spiritualist named Mazuki (played by Hiroko Tanaka) to solve a bizarre case of killings from a mystical sea creature.

Muto resumed teaming with Hiroshi Hase in the fall of 1993 and the duo wrestled the Steiner Brothers in a losing effort at Battlefield on January 4, 1994. Muto reprised his Great Muta moniker for a dream match against the legendary Antonio Inoki at May's Wrestling Dontaku, which Muta lost. In October, Muto and Hase entered the Super Grade Tag League, where they lost only two matches in the tournament, winning rest of their matches and scored fourteen points, thus advancing to the finals on October 30, where they defeated Masahiro Chono and Super Strong Machine to win the tournament, thus earning an IWGP Tag Team Championship opportunity against Hell Raisers on November 25, which Muto and Hase won, thus marking their second reign as a team and Muto's fourth individual tag title reign. They successfully defended the titles against Steiner Brothers in their first title defense at Battle 7 on January 4, 1995.

On April 17, 1994, Muto returned to WCW to face Stunning Steve Austin at Spring Stampede for the WCW United States Championship. Austin defeated him by disqualification. This would be his last US appearance for nearly a year, and he would not return until February 19, 1995, when he was shown in the crowd at SuperBrawl IV. He returned to WCW on May 21, 1995, to defeat Paul Orndorff at Slamboree '95.

On January 4, 1993, Muta defeated Masahiro Chono in a title versus title match at Fantastic Story in Tokyo Dome (known in North America as WCW/New Japan Supershow III) to retain the IWGP Heavyweight Championship and win the NWA World Heavyweight Championship, thus becoming the second of the only two men to hold both titles at the same time, the first being Tatsumi Fujinami. After losing the NWA title in WCW, Muta had a variety of challengers in title matches and exhibitions throughout the year. He lost to Hulk Hogan at Wrestling Dontaku in May and then successfully defended his IWGP title against The Great Kabuki on June 15. After holding the title for longer than a year, Muta finally lost the title to Shinya Hashimoto on September 20. Following this title loss and a match with Hogan against the Hell Raisers (Hawk Warrior and Power Warrior) on September 23, Muto returned to fighting primarily under his real name, reviving the Muta name for certain matches. On December 10, Muto received a rematch against Hashimoto for the IWGP Heavyweight Championship, which he failed to win.

On January 4, 1992, Muto headlined the Super Warriors in Tokyo Dome event as Great Muta by teaming with Sting for the first time ever to defeat The Steiner Brothers at the Tokyo Dome. This was the first January 4 Tokyo Dome Show, which would become the flagship event for NJPW in years to come. At the NJPW 20th Anniversary Show on March 1, Muto and Hase lost the IWGP Tag Team Championship to Big Van Vader and Crusher Bam Bam Bigelow. Muto continued to rise as a singles competitor, gaining his first title shot at the prestigious IWGP Heavyweight Championship against Riki Choshu on May 17, which he failed to win. Muto participated in the 1992 G1 Climax for the vacant NWA World Heavyweight Championship, defeating Barry Windham in the opening round in Shizuoka on August 6 and Steve Austin in the quarterfinals on August 10, before losing to the eventual winner Masahiro Chono in the semi-finals on August 11.

In 1992, Muto married his wife, Hisae Ashida. Together they have two children, a son (born 1996) and a daughter, Airi (born 2000), who is an actress and has made an appearance for Wrestle-1.

Muto revived his Great Muta moniker at the WCW and NJPW-jointly promoted Starrcade in Tokyo Dome event on March 21, 1991, where he defeated Sting. Later that year, Muto and Chono, along with Hashimoto, cemented their status as the next generation of New Japan, surpassing Antonio Inoki, Tatsumi Fujinami, and Riki Choshu, after the finals of the first G1 Climax tournament on August 11. He lost to Scott Norton but defeated Tatsumi Fujinami and Big Van Vader in his block to advance to the final against Chono, which turned out to be an epic thirty-minute match in which Muto was bested by Chono and, together with Hashimoto, the three celebrated in the ring, then afterwards they were officially labeled "The Three Musketeers" of New Japan Pro-Wrestling. In October, Muto paired with Hiroshi Hase to participate in the 1991 Super Tag League, where they lost three of their tournament matches and won three, narrowly missing the chance to qualify for the knockout stage. However, shortly after the tournament, the duo found success as they defeated Rick Steiner and Scott Norton to win the IWGP Tag Team Championship at Budokan Hall on November 5.

Muta continued to make sporadic appearances within WCW during 1991 while wrestling regularly in New Japan. He was shown in attendance at WrestleWar 91, and then defeated old rival Sting at the combined New Japan/WCW Starrcade event on March 21, 1991, in Tokyo, Japan. Muto was entered into a match with United States Heavyweight Champion Lex Luger to determine the Number One Contender for the WCW World Heavyweight Championship. On June 12 at Clash of the Champions XV, Muta was pinned by Luger to earn the right to challenge Ric Flair at The Great American Bash '91. He went on to wrestle several house shows that month before returning to Japan.

Muto quickly rose in the ranks upon returning to New Japan in March 1990. He made his in-ring return to NJPW on April 27 by teaming with Masahiro Chono to defeat Shinya Hashimoto and Masa Saito to win the IWGP Tag Team Championship, marking Muto's second reign with the title. He and Chono would hold the titles for over six months, before finally losing them to Hiroshi Hase and Kensuke Sasaki on November 1. During this time, Muto also entered the Kyushu Cup tournament on June 12, in which he defeated Chono to advance to the finals of the tournament, where he lost to Hashimoto. On September 7, Muto introduced his Great Muta moniker for the first time in NJPW during a match against Samurai Shiro, which Muto won. Muto would occasionally perform the Muta gimmick for major matches while competing under his real name for regular matches. On September 30, Muta picked up a huge win over Ricky Steamboat.

On August 16, Muto, donned his Great Muta persona to beat Japanese legend Riki Choshu to win the Greatest 18 Club Championship and the IWGP Heavyweight Championship for the first time, thus winning the first world championship of his professional wrestling career. He successfully defended both titles against Shinya Hashimoto on September 23 and then retired the Greatest 18 Club Championship to focus on defending the IWGP Heavyweight Championship. He successfully defended the title against Scott Norton on October 18 and Sting on November 22. On December 14, Muta faced Hiroshi Hase in a winning effort in a famous match where Hase used a foreign object to beat at Muta's forehead, as payback for their previous encounters, including the September 14, 1990, encounter, in which Muta busted Hase open. Muta bladed and cut very deeply into his forehead. As a result of this, Muta bled profusely for the rest of the match, and to this day he still bears scars from where he sliced.

Muto first appeared as "The Great Muta" in the NWA's World Championship Wrestling territory on the March 18, 1989, edition of Saturday Night, although announcer Jim Ross pronounced the name as "The Great Muto". His manager Gary Hart introduced him as the son of the Great Kabuki, whom Gary Hart also had managed years earlier. He wrestled his first match under the new persona on April 2 against Scott Casey. Muta would feud with stars like Lex Luger, Ric Flair, and Sting, from whom he would capture the NWA World Television Championship on September 3, 1989. Muto eventually lost the championship to Arn Anderson on January 2, 1990, which aired on the January 12, 1990, edition of Power Hour, and some time after the Clash of the Champions X on February 6, Muto would return to New Japan, going between his real name and his Muta gimmick as he pleased.

In January 1988, Muto went on another excursion, this time in Puerto Rico for the World Wrestling Council (WWC) under his new ring name, "The Super Black Ninja". He feuded with Miguel Perez Jr., with whom he lost a hair vs. hair match to that April. It was in Puerto Rico he formed The Three Musketeers with Masahiro Chono and Shinya Hashimoto. He wrestled only one match in New Japan during this period on July 29, before returning to Puerto Rico. In the fall of 1988, Muto moved to the Dallas, Texas-based World Class Championship Wrestling, where he reunited with Kendo Nagasaki and had a very short lived feud with Kevin Von Erich before departing the organization in March 1989. Muto's personality and ring skills shown in his early American matches earned him a high billing within the National Wrestling Alliance.

In March 1987, Muto won the IWGP Tag Team Championship with Shiro Koshinaka, before losing the titles to Akira Maeda and Nobuhiko Takada six days later. In the summer of 1987, Muto took part in the NOW vs. NEW feud, in which he aligned himself with Antonio Inoki and his group, teaming with the likes of Inoki, Seiji Sakaguchi, Yoshiaki Fujiwara, and Kantaro Hoshino, and battling the likes of Tatsumi Fujinami, Riki Choshu, Akira Maeda, Kengo Kimura, and Super Strong Machine.

Muto was a judo black belt with experience in many national competitions prior to being trained by Hiro Matsuda in the New Japan Pro-Wrestling Dojo. He debuted on October 5, 1984, against Masahiro Chono. In 1985, Muto was sent on his first learning excursion to the United States. Primarily wrestling in the southern U.S. as the "White Ninja", Muto teamed with Kendo Nagasaki. During his first excurision, Muto became a one-time NWA Florida Heavyweight Champion and a one-time NWA Southeastern United States Junior Heavyweight Champion. Muto returned to New Japan in 1986, where he was nicknamed "Space Lone Wolf", a space-age type character that was briefly revived in 2005 by NOSAWA Rongai.

Keiji Muto (武藤 敬司 , Mutō Keiji, born December 23, 1962) is a Japanese professional wrestler who first gained international fame in various National Wrestling Alliance (NWA) territories. He is mostly known for his work as The Great Muta (ザ・グレート・ムタ , Za Gurēto Muta) in New Japan Pro-Wrestling (NJPW) during the 1990s, but he has also worked in the contiguous United States, Puerto Rico, Mexico, and Taiwan. He is a former president of All Japan Pro Wrestling (AJPW), as well as being a full-time wrestler for the promotion from 2002 to 2013.