Nitro

Impact began a feud with the Impact World Champion Austin Aries, which led to a match at Bound for Glory. As the PPV moved closer, the feud started to blur the lines between a work (something scripted) and shoot (something real), beginning with the two wrestlers trading insults on Twitter that they appeared to take personal, with Aries later deleting many of his tweets. Specifically, Impact mocked Aries' short stature and the champion responded by making fun of his wife's weight. Aries and Impact both alleged in the media that they authentically took issue with comments. TMZ Live also pushed the angle "like [it] was a shoot". The two wrestlers got in a brawl the night before Bound for Glory during Abyss's Impact Hall of Fame induction. At the event, Impact defeated Aries to win the Impact World Championship. Throughout the following weeks, Impact successfully defended his title against Fénix, Killer Kross, and Matt Sydal. At Homecoming on January 6, 2019, Impact defeated Brian Cage to retain his championship.

On September 26, 2019, it was reported by Mike Johnson of Pro Wrestling Insider that Hennigan had re-signed with WWE, being confirmed on December 3 on WWE Backstage. He made his return on January 3, 2020 episode of SmackDown under his John Morrison ring name and resumed his partnership with The Miz. They would feud with the SmackDown Tag Team Champions, The New Day, with Morrison winning singles matches against Big E and Kofi Kingston. At the Royal Rumble, Morrison participated in the Royal Rumble match as the fifth entrant, but he was eliminated by Brock Lesnar. At Super ShowDown, Miz and Morrison won the SmackDown Tag Team Championship from The New Day.

Hennigan's performance as a contestant and the episode of his elimination received critical acclaim. Chris Chase of USA Today praised Hennigan for being "true to everything we’ve seen from him this season, [and] a class act after his shock defeat". Writing for People, former Survivor contestant Stephen Fishbach highlighted that "in a tribal council that was meant to take out the Davidest David [Christian Hubicki], it was really the Goliath of the Goliaths [Hennigan] who fell. How perfectly Biblical." The show’s executive producer and host Jeff Probst was "so impressed" with Hennigan, describing him as "the guy who catches the winning touchdown pass in the final moments of the Super Bowl, and then, instead of some crazy celebration, he casually tosses the ball to the ref, kisses his wife and hugs his kids", alongside stating that he would "absolutely" have Hennigan back on the show.

Mundo made his return on the fourth season's premiere, competing in Aztec Warfare entering at number 11. Mundo eliminated Ricky Mundo and Daga before getting eliminated by Marty Martinez and being attacked by the Reptile Tribe. On November 17, 2018, Mundo wrestled on the final episode of Lucha Underground, Ultima Lucha Cuatro, defeating Matanza Cueto in a Sacrifice to the Gods match.

On January 26, 2018 at Guerra de Titanes, Mundo lost the AAA Mega Championship to Rey Wagner, ending his reign at 314 days.

In August 2017, despite not being signed to the promotion at the time, Hennigan appeared for Impact Wrestling at some live events. On August 17, a video package was shown at Destination X revealing his ring name as Johnny Impact. His first feud in the promotion was with Eli Drake, when Impact made his televised in-ring debut on the August 24 episode of Impact!, participating in a Gauntlet for the Gold match for the vacant Global Championship, but was eliminated by eventual winner Eli Drake. Impact would face Drake for the title at Victory Road and Bound for Glory, where he failed to win the title. Since the Bound for Glory match ended after Alberto El Patrón made an interference, Impact, Alberto and Drake had a three-way Last Chance Six Sides of Steel match on the January 25, 2018 episode of Impact!, where Drake retained the title.

On January 28, 2017, Morrison won a tournament at a 5 Star Wrestling event for the 5 Star Wrestling Championship, defeating Moose, Drew Galloway, and Rey Mysterio to win the title. On February 8, 2018, he lost the title against Jake Hager after over a year as champion.

After adopting an "anti-Mexico" attitude and teaming with El Mesías and Hernandez to defeat El Texano Jr., El Hijo del Fantasma and Pentagón Jr., Mundo challenged the latter to a match at Triplemanía XXIV for the AAA Latin American Championship, to which Pentagón accepted. At the event, on August 28, Mundo defeated Pentagón to win the Latin American Championship, marking his first championship in AAA and becoming the first non-Mexican to hold the title. On October 2 in the main event of Héroes Inmortales X, Mundo successfully defended his title against Garza Jr. On March 19, 2017, at Rey de Reyes, Mundo defeated El Texano Jr. and El Hijo del Fantasma in a three-way match to not only retain the Latin American Championship, but to also win Texano's AAA Mega Championship and Fantasma's AAA World Cruiserweight Championship. In his first AAA Mega Championship defense, on June 30, Mundo successfully retained his title against Texano.

In July 2017, Mundo and his fiancée Kira Forster, known as Taya, were involved in controversy with AAA and its Director of Talent Vampiro, which led to Taya's departure from the company. According to Wrestling Observer, AAA asked Mundo to turn in Taya's Reina de Reinas Championship for a photo shoot the day prior to an event on July 1. A few weeks later, Vampiro addressed to the live crowd that Forster was stripped of the title due to not appearing to defend her title, despite not being scheduled to appear.

Hennigan was involved in an on-off relationship with former WWE Diva and on-screen manager Melina Perez from 2003 to 2015. The pair met during the auditions for Tough Enough III, in which Perez was cut and Hennigan eventually won. Since 2016, Hennigan has been in a relationship with Taya Valkyrie, to whom he got engaged to on June 14, 2017. They were married on June 1, 2018.

On June 28, 2016, it was announced that Hennigan would make his debut for Pro Wrestling Guerilla in the company's annual Battle of Los Angeles tournament. He won his match against Matt Sydal in the first round, but was eliminated by Ricochet in the quarter-finals.

On the February 3, 2016 episode of Lucha Underground, Mundo faced Killshot in a winning effort. After the match, Mundo taunted Lucha Underground Champion Mil Muertes, only to be confronted by Cage. Mundo defeated Cage on February 24, after interference from the debuting Taya, subsequently becoming Mundo's valet. On the May 25 episode of Lucha Underground, Taya revealed to PJ Black and Jack Evans that their partner Fénix was injured by Mundo. As Mundo revealed himself as Fénix's replacement for their match, Black and Evans allied with the two. Later that night in the main event, Mundo, Black and Evans defeated Rey Mysterio Jr., Prince Puma and Dragon Azteca Jr. to win the Lucha Underground Trios Championship, the first championship for each in Lucha Underground. The week after, Mundo, Black and Evans, now collectively billed as Worldwide Underground, retained their championships in a rematch via disqualification. Worldwide Underground lost their titles to Aero Star, Drago and Fénix at the third and final part Ultima Lucha Dos, which aired on July 20.

On January 7, 2015, Mundo participated in a 20-man "Aztec Warfare" battle royal for the Lucha Underground Championship. He was the second luchador to enter the ring, but was the last man eliminated by Prince Puma who won the Championship. King Cuerno attacked Mundo on the February 4 episode, beginning a feud between them; the second installment took place on the episode which aired March 11, where Mundo and Cuerno wrestled in a Steel Cage match, which was won by Mundo. On May 13, Mundo turned into a villain when he attacked Alberto El Patrón in his match against Hernandez, throwing him through the window of Dario Cueto's office. Mundo subsequently tossed El Patrón back into the ring, giving Hernandez the win. On the June 17, episode of Lucha Underground, Johnny Mundo unsuccessfully challenged Prince Puma for the Lucha Underground Championship in an Iron Man match. On August 5, 2015, at Ultima Lucha, Mundo defeated Alberto El Patrón after an interference by his girlfriend Melina Perez.

On May 24, 2015, Mundo made his debut for Lucha Libre AAA Worldwide (AAA) at the Lucha Libre World Cup event representing Lucha Underground as a member of "Team TNA/Lucha Underground" alongside TNA wrestlers Matt Hardy and Mr. Anderson. They finished in second place, losing in the finals to the "Dream Team" (El Patrón Alberto, Myzteziz and Rey Mysterio Jr.).

On June 4, 2015 in the main event of Verano de Escándalo, Mundo established himself as a rudo (or villain) and teamed with El Mesias and Pentagón Jr. losing to Myzteziz, La Parka and Rey Mysterio Jr. On September 27, Konnan announced Mundo as an official member of the rudo stable, La Sociedad, while he subsequently stepped down as the leader of the group. On October 4, at Héroes Inmortales IX, Mundo unsuccessfully challenged El Patrón Alberto for the AAA Mega Championship, when he was defeated by disqualification. After Alberto left AAA, Mundo was scheduled to face Rey Mysterio Jr. for the vacant AAA Mega Championship at Guerra de Titanes, but after the matches of the event were officially announced, neither Mundo nor Mysterio were featured for the event. Mundo participated in the 2016 Lucha Libre World Cup as a member of "Team Lucha Underground" alongside Chavo Guerrero Jr. and Brian Cage, defeating "Team Mexico Leyendas" (Blue Demon Jr., Canek, and La Parka) in the quarter-finals, and "Team Mexico International" (Rey Mysterio Jr., Dr. Wagner Jr., and Dragon Azteca Jr.) in the semi-finals. Mundo's team won the tournament defeating "Team AAA" (Pentagón Jr., El Texano Jr. and Psycho Clown) in the finals.

In September 2014, it was reported that Hennigan had signed with the El Rey network's new television series, Lucha Underground, where he wrestled under the ring name Johnny Mundo. Mundo wrestled in the main event of the debut episode of Lucha Underground on October 29, 2014, defeating Prince Puma and winning one hundred thousand dollars, which was then taken away from him by promoter Dario Cueto, setting up several feuds. He then teamed with Prince Puma during the November 5, 2014 episode, defeating Cortez Castro and Mr. Cisco. On the November 19 episode, Mundo defeated Big Ryck by disqualification after interference by Castro and Cisco. Mundo then defeated Prince Puma and Big Ryck in the main event of the December 10, 2014 episode, which was a three-way ladder match, to finally win the hundred thousand dollars he was denied in the Lucha Underground debut.

On June 21, 2013, Hennigan defeated Carlito Caribbean Cool in FWE Welcome to the Rumble II, winning the FWE Heavyweight Championship. The next day, Hennigan defended the title against Too Cold Scorpio at House of Hardcore 2. On October 12, 2013, at FWE Grand Prix, Hennigan defeated Matt Morgan, retaining the FWE Heavyweight Championship. On March 11, 2015, Hennigan lost the FWE Heavyweight Championship to A.J. Styles.

After leaving WWE, Hennigan began wrestling on the independent circuit under his real name, as well as his previous ring name John Morrison. On his first post-WWE wrestling appearance, Hennigan rekindled an old feud, facing off against Shelton Benjamin in the main event of the World Wrestling Fan Xperience (WWFX) Champions Showcase Tour in Manila, Philippines on February 4, 2012. Hennigan won the match to become the inaugural WWFX Heavyweight Champion. On August 12, 2012, Hennigan appeared at Juggalo Championship Wrestling's Bloodymania 6 event, defeating Matt Hardy and Breyer Wellington in a three-way match. On January 25, 2013, Morrison appeared at Dragon Gate USA's Open the Golden Gate, defeating Akira Tozawa in the main event of the show. Hennigan took part in the WrestleMania weekend, wrestling for the Pro Wrestling Syndicate. On April 4, Hennigan defeated Elijah Burke and on April 5, Morrison defeated Japanese legend Jushin Thunder Liger in an "International Dream Match" at a Pro Wrestling Syndicate (PWS) event.

After leaving WWE in November 2011, Hennigan began wrestling overseas on the independent circuit under several ring names before finding success in lucha libre wrestling promotions Lucha Underground and Lucha Libre AAA Worldwide as Johnny Mundo. In Lucha Underground, Hennigan was a central fixture throughout all four seasons of the show, winning matches in the first and the final episodes of the promotion's history. He is also the second Triple Crown Champion, having held the Lucha Underground, Gift of the Gods and Trios Championship once each. In AAA, he was the promotion's first-ever triple champion, holding the AAA Mega, Latin American, and World Cruiserweight Championships simultaneously. He also (with partners Chavo Guerrero Jr. and Brian Cage) won the 2016 Lucha Libre World Cup. Hennigan signed with Impact Wrestling in 2017, where he was known as Johnny Impact. He headlined the promotion's 2017 and 2018 Bound for Glory events and won the Impact World Championship once. After leaving the promotion in July 2019, he re-signed with WWE in September that same year. He is the only wrestler in history to have been the ECW, AAA Mega, Lucha Underground and Impact World Champion.

On April 26, Morrison was drafted to the Raw brand as part of the 2010 WWE draft, and lost his first match back for the brand later that night to Jack Swagger. Later that week, in his final match on SmackDown, he lost to Cody Rhodes. On June 1, Morrison announced that he would be mentoring Eli Cottonwood in the second season of NXT. Cottonwood, however, was the second person eliminated from the competition, and was eliminated on July 27 episode of NXT. Morrison then went on to participate in the main event of SummerSlam in which he and six teammates (John Cena, Edge, Chris Jericho, Bret Hart, R-Truth, and Daniel Bryan) were victorious in a seven-on-seven elimination tag team match against The Nexus. In October 2010, Morrison began a feud with Sheamus after he helped Santino Marella earn an upset win during a one-sided match against Sheamus. Within the following weeks, Morrison continued to save Marella from attacks by Sheamus. At Survivor Series, Morrison defeated Sheamus. Morrison entered the 2010 edition of the King of the Ring tournament, defeating Tyson Kidd, Cody Rhodes, and Alberto Del Rio. Morrison lost to Sheamus in the final round. He continued to feud with Sheamus and defeated him in a WWE Championship number one contender's ladder match at the Tables, Ladders & Chairs pay-per-view on December 19. Morrison received his WWE Championship match on January 3, 2011 episode of Raw, but lost to reigning champion The Miz in a falls count anywhere match. On January 30, Morrison participated in the Royal Rumble match at the Royal Rumble event and despite not winning, he had a stand-out moment which was praised by critics as "arguably the spot of the decade" when Morrison was knocked off of the ring apron and performed a cat leap onto the barricade to avoid having his feet touch the floor and then went on to precision jump onto the ring steps and re-enter the ring. On February 20, Morrison participated in the Elimination Chamber match at the Elimination Chamber pay-per-view event, but was eliminated by CM Punk. During the match, Morrison climbed to the top of the cage while inside the cage before dropping to deliver a crossbody on and eliminate Sheamus. At WrestleMania XXVII, Morrison teamed with Trish Stratus and Jersey Shore guest star Snooki in a mixed tag match to defeat the team of Dolph Ziggler and LayCool (Layla and Michelle McCool).

In his last advertised WWE appearance on the November 28 episode of Raw, Morrison faced The Miz in a Falls Count Anywhere match; Miz won the match by delivering the Skull-Crushing Finale on the steel entrance stage, giving Morrison a kayfabe injury. This was used to write Morrison off television, even being stretchered out of the arena after the match. On November 29, WWE acknowledged the end of Morrison's contract, and moved his profile to the alumni section of its website. In a video published on December 9, 2011, via Hennigan's personal YouTube channel, Hennigan claimed that he was taking time off to heal and retrain for a possible return to wrestling in the future. In 2015, Hennigan revealed on Stone Cold Steve Austin's podcast that WWE wanted him to sign another multi-year contract, but due to a neck injury, residual pain, and creative frustrations, he decided to not renew his contract, wanting "more control over [his] time".

During the February tapings for Impact Wrestling, Impact defended his title in a four-way contest involving Killer Kross, Moose and Brian Cage. Impact hit his finisher on Moose, barely seconds prior to Cage hitting his Drill Claw finisher on Killer Kross. As Impact was able to cover his opponent first the referee was able to provide the count and therefore Impact won the match as Brian Cage went to cover his opponent. On the March 15 episode of Impact Wrestling, Impact's wife Taya Valkyrie would low blow Cage, which allowed Impact to attack Cage, turning into a villain. At United We Stand, Impact won a five-way Ultimate X match to become the number one contender for the Impact X Division Championship. Throughout April, Impact successfully defended his title from Cage, often with interferences from Valkyrie and former referee John E Bravo. At Rebellion, Impact, accompanied by Valkyrie and Bravo, lost the title to Cage in a match where Lance Storm was special guest referee; this left Impact's reign to end at 196 days, leaving it the longest reign since Bobby Roode's 2011–2012 reign, and therefore the longest reign in seven years, as well as the third-longest reign in history.

After leaving WWE in 2011, Hennigan started to pursue a career in the film industry as an actor and a filmmaker. In 2013, he co-starred in 20 Feet Below: The Darkness Descending with Danny Trejo, as well as served as co-producer of the film. In 2017, Hennigan released his first major feature film titled Boone: The Bounty Hunter, in which he starred, co-wrote, and served as executive producer. Hennigan sold his house in order to finance the film. In 2018, Hennigan began working on his directorial debut, a short film titled The Iron Sheik Massacre which he also produced and co-wrote with his wife Kira Forster. It is expected to be released in 2020.

On September 4 episode of SmackDown, Morrison defeated Rey Mysterio to win his third Intercontinental Championship. Morrison then began a feud with Dolph Ziggler, after losing a non-title match to him by countout, but he would successfully defend the title against Ziggler at Hell in a Cell, and again on the following episode of SmackDown. The feud between Morrison and Ziggler continued throughout the next month, with the two wrestling to a double countout for the Intercontinental Championship on the November 13 episode of SmackDown and Morrison retaining the championship in a two-out-of-three falls match the following week to end the feud. At Bragging Rights, Morrison was defeated by his former tag team partner then-United States Champion The Miz in an interbrand Champion vs. Champion match. Their rivalry continued after both were announced as opposing team captains for Survivor Series, where Miz's team defeated Morrison's team. Morrison then went on to feud with newcomer Drew McIntyre, who defeated Morrison in a non-title match on the December 4 episode of SmackDown, thus earning a championship opportunity against Morrison. At the TLC: Tables, Ladders & Chairs pay-per-view, Morrison lost the Intercontinental Championship to McIntyre, ending his reign at 103 days. He received his rematch on the first SmackDown of 2010, but was disqualified when McIntyre shoved him into the referee. He challenged McIntyre for the Intercontinental Championship again on the January 29 episode of SmackDown in a No Disqualification match, but lost, ending their feud. Morrison later won an Elimination Chamber qualifying match and participated in the eponymous match for the World Heavyweight Championship, but was eliminated by The Undertaker. On the March 5 episode of SmackDown, Morrison teamed with R-Truth to defeat Cryme Tyme and The Hart Dynasty to earn a Unified WWE Tag Team Championship match against ShoMiz (Big Show and The Miz). At the WrestleMania XXVI, they failed to win the championship.

In 2009, Hennigan and Maryse Ouellet were interviewed on Eurosport. In 2009, Hennigan appeared on two episodes of Are You Smarter Than a 5th Grader?, which were both aired on September 29. Hennigan is the subject of a WWE DVD, called John Morrison – Rock Star, which was released on February 16, 2010. The DVD covers his career from his name change to John Morrison up until his Intercontinental Championship win in September 2009. He appeared on an episode of Destroy Build Destroy on March 3, 2010. Hennigan was on the cover of Muscle & Fitness in June 2010, with the issue also featuring an interview and photo shoot. In 2016, Hennigan, Rey Mysterio, and King Cuerno appeared on ESPN to promote the second season of Lucha Underground.

On April 15, Morrison returned to the SmackDown brand as part of the 2009 Supplemental Draft. In Morrison's first match back for the brand, on April 17, he defeated R-Truth. On the May 1 episode of SmackDown, Morrison engaged in a backstage fight with Chris Jericho after Jericho slapped him, turning into a face character in the process for the first time in his career. Later that same night, Morrison defeated Shelton Benjamin, beginning a feud between the two. On the May 7 episode of Superstars, Morrison lost a match to Jericho after a distraction by Benjamin. Morrison continued to score victories over Benjamin in singles and tag team matches before defeating him at Judgment Day. During this time, Morrison would soon become wildly popular with fans. On the June 19 episode of SmackDown, Morrison lost a critically acclaimed match against Edge, in which the commentators described it as a "third main event". On the July 31 episode of SmackDown, Morrison had his first World Heavyweight Championship match against Jeff Hardy, but failed to win the title.

Though rivals, Morrison and The Miz faced the dysfunctional tag team of Matt Hardy and Montel Vontavious Porter on the November 16 episode of SmackDown! for the WWE Tag Team Championship in a winning effort, marking Morrison's fourth WWE Tag Team Championship reign. At Survivor Series, Morrison and The Miz were both defeated by CM Punk in a triple threat match for the ECW Championship. After the defeat, the rivalry aspect of Morrison and Miz's relationship faded, as they were now portrayed as trusting friends. Morrison competed in the 2008 Royal Rumble match on January 27, but failed to win after being eliminated by Kane. In February 2008, Morrison and Miz were given a streaming segment on WWE.com named The Dirt Sheet in which they mocked other wrestlers and facets of pop culture. Morrison and Miz co-wrote each episode of The Dirt Sheet each week, and he credits his time in college studying film with contributing to the success of the show. The team had many successful title defenses over the next few months, before dropping the titles to Curt Hawkins and Zack Ryder at The Great American Bash in a fatal four-way match which also featured Jesse and Festus, and Finlay and Hornswoggle. Neither Morrison nor Miz were pinned, as Hawkins pinned Jesse to win the titles.

Afterwards, they started a feud with Cryme Tyme (JTG and Shad) through each team's Internet show, which then transitioned to matches on Raw and at Cyber Sunday. After winning the Slammy Award for Best WWE.com exclusive earlier in the day, Morrison and Miz won the "Tag Team of the Year" Slammy Award on December 8, 2008 episode of Raw. On December 13, Morrison and Miz won the World Tag Team Championship from CM Punk and Kofi Kingston at a live event. Morrison and Miz engaged themselves in a feud with The Colóns (Carlito and Primo), who were the reigning WWE Tag Team Champions, which resulted in both teams defending their respective championships successfully in separate matches. Their feud culminated in a tag team lumberjack match where both titles were on the line at the WrestleMania XXV, but it was The Colóns who would unify the championships with a win. On April 13, as part of the 2009 WWE draft, The Miz was drafted to the Raw brand to split up the team, and as a result, Miz attacked Morrison.

Hennigan was described by WWE as having "lightning-fast offense", "high-risk aerial expertise", and "incredible agility". He is known to utilize a split-legged corkscrew moonsault, dubbed Starship Pain, as a finishing maneuver. During his singles run as Johnny Nitro, he used a standing shooting star press as his finisher. After transitioning to his John Morrison character, Hennigan began using a corkscrew neckbreaker dubbed Moonlight Drive, in reference to the song of the same name written by Jim Morrison. He also prominently used a superkick as a finisher in 2008 during a feud with D-Generation X, as a way to mock Shawn Michaels's Sweet Chin Music maneuver. Hennigan is a practitioner of parkour and often incorporates it into his wrestling style, giving him the nickname "The Prince of Parkour". He also has a background in breakdancing, gymnastics, and martial arts.

In November, MNM reunited on an episode of Raw to accept an open challenge from The Hardy Boyz (Jeff Hardy and Matt Hardy) at December to Dismember, a match that they lost. MNM and The Hardy Boyz feuded across the brands throughout December, with the two teams competing in a four-way ladder match for the WWE Tag Team Championship at Armageddon, also involving Brian Kendrick and Paul London and Dave Taylor and William Regal. However, MNM would be unsuccessful in winning the championship. Nitro challenged Jeff Hardy for the Intercontinental Championship in a steel cage match at New Year's Revolution on January 7, 2007, but did not win. MNM lost to The Hardy Boyz at the Royal Rumble later that month and again at No Way Out in February which ended the feud. MNM disbanded as a team when Mercury was released from WWE in March 2007.

After Mercury's departure, Nitro also ended his association with Melina. Nitro was placed in a tag team with Kenny Dykstra, until the 2007 WWE draft, during which Nitro was sent to the ECW brand and Dykstra was sent to SmackDown. Nitro made his debut for the brand on the June 19 episode of ECW, with a win over Nunzio, and few days later, on June 24, at Vengeance: Night of Champions, he won the vacant ECW World Championship by defeating CM Punk, replacing the absent Chris Benoit due to his double-murder suicide. A few weeks after winning the title, Nitro was repackaged as John Morrison, a reference to musician Jim Morrison, to whom Hennigan bears a strong physical resemblance. In the months to come, Morrison would retain the championship against Punk at The Great American Bash in July, and SummerSlam in August. Punk would again challenge for the championship on the September 4 episode of ECW, in which Morrison lost the championship to Punk, ending his reign at 69 days. Morrison was then suspended for thirty days for violating WWE's Wellness Program, renewing his feud with Punk upon his return, as well as competing against The Miz for the number one contendership to the title.

Alongside his team MNM, Hennigan debuted on WWE television as Johnny Nitro, presenting himself as an arrogant wrestler with "elite Hollywood status". After winning the ECW World Championship in 2007, he changed his ring name to John Morrison and his gimmick was tweaked to be even more conceited and self-aggrandizing — in addition to being modeled after Jim Morrison, the legendary frontman of the 1960s rock band The Doors, to whom he bears a strong physical resemblance.

In their debut match on the main roster, MNM won the WWE Tag Team Championship from Eddie Guerrero and Rey Mysterio. MNM held the titles for three months, having successful titles defenses against the teams of Guerrero and Mysterio, and Charlie Haas and Hardcore Holly, before dropping them to the Legion of Doom at The Great American Bash. They won the titles again in a four-way match defeating Legion of Doom, The Mexicools, and William Regal and Paul Burchill, but lost them to Rey Mysterio and Batista days before Armageddon in December. Due to help from Mark Henry, MNM defeated Mysterio and Batista in a rematch on December 30 to win the championship for the third time. They began a rivalry with the team of Paul London and Brian Kendrick that lasted over three months, until they dropped the championship to London and Kendrick at Judgment Day in May 2006, with the storyline leading to Nitro and Melina suddenly turning on Mercury after the match, breaking up the group. Later that night, Melina and Nitro were booked off the SmackDown! brand by having the General Manager, Theodore Long, "fire" them.

Hennigan was the winner of Tough Enough III, a televised competition that would award the winner a WWE contract, and was assigned to their then developmental territory, Ohio Valley Wrestling (OVW), to continue his wrestling training. Hennigan was called up to the SmackDown! roster in April 2005 under the ring name Johnny Nitro and on his debut match, Hennigan (as a part of MNM) won the WWE Tag Team Championship.

Upon his return to OVW, Nitro was put into a feud with Matt Cappotelli. During the course of the feud, Melina was brought into the company as Nitro's ex-girlfriend and an ally of Cappotelli, only to turn on him and side with Nitro. Not long after, Nitro and Melina were joined by Joey Mercury, forming the stable MNM. MNM wrestled in OVW for around a year, holding the OVW Southern Tag Team Championship once, before losing the titles to Cappotelli and Johnny Jeter in January 2005. They were soon called up to the main SmackDown brand in April that same year.

On March 1, 2004 episode of Raw, Hennigan debuted on main roster as a villain, under the ring name "Johnny Blaze". His gimmick was that he was the apprentice and assistant of the Raw General Manager, Eric Bischoff. The next week his name was changed to "Johnny Spade", and three weeks after that it was changed to "Johnny Nitro". The Nitro name, which finally stuck, was a reference to WCW Monday Nitro, the flagship show of World Championship Wrestling (WCW) for which Bischoff had previously worked. To drive the point home, he began using the Nitro theme as his ring entrance music. Nitro acted as Bischoff's apprentice and assistant until June, when he was sent back to OVW. To explain his departure, Nitro lost a match on June 7 episode of Raw against Eugene, which carried the stipulation that upon his loss, he also lost his job.

Before getting into professional wrestling, Hennigan attended the University of California, Davis studying both film and geology. Upon deciding that he did not want to pursue either path, Hennigan began his professional wrestling career training at the Supreme Pro Wrestling school in Sacramento, California. After failing his audition for Tough Enough 2, a competition in which the winner earned a World Wrestling Federation (WWF) contract, he was accepted as a cast member for Tough Enough III in 2002, eventually becoming the co-winner with Matt Cappotelli. For winning, Hennigan was awarded a developmental contract and assigned to their developmental territory, Ohio Valley Wrestling (OVW), to continue his training. Hennigan competed in Acolytes Protection Agency's invitational Bar Room Brawl match at Vengeance in July 2003. Hennigan and Cappotelli made an appearance on an episode of Heat in January 2004, losing to Garrison Cade and Mark Jindrak.

John Randall Hennigan (born October 3, 1979) is an American professional wrestler, traceur, actor, and filmmaker. He is signed to WWE, where he performs on the SmackDown brand under the ring name John Morrison.

John Randall Hennigan was born on October 3, 1979, in Los Angeles, California, and grew up in Palos Verdes Peninsula, where he attended high school. He graduated from the University of California, Davis in 2002 with a film major.

Hennigan was a contestant on the 37th season of Survivor, Survivor: David vs. Goliath where he was originally part of the Goliath tribe and later Tiva before making it to the merged tribe Kalokalo. He finished 12th and became the second member of the jury after the former members of the Goliath tribe were blindsided at tribal council; two contestants used hidden immunity idols, causing Hennigan to be eliminated despite only having three elimination votes, as Christian Hubicki, who received seven, was immune.