Tegan Nox

Due to Newell’s departure to WWE, Fight Club: Pro honored her with a show named after her “First Female of Fight Club” where Nixon requested to face Candice LeRae. This match ended after Newell hit LeRae with the Shiniest Wizard.

Newell’s final FCP match took place at Dream Tag Team Invitational (Night 1) where she was a surprise entrant in a 6 way match.

On June 25, 2019, Nox made her in-ring return at an NXT live event in Orlando, Florida. On September 11, Nox made her NXT UK debut when she defeated Shax. Afterwards, Nox began a feud with NXT UK Women's Champion Kay Lee Ray, resulting in a championship match between the two on the October 2 episode of NXT UK, where Nox was unsuccessful. On October 16, Nox returned to NXT, defeating Taynara. Thereafter, Nox began teaming with long-time friend Dakota Kai, with the two defeating Jessamyn Duke and Marina Shafir to become number one contenders to the WWE Women's Tag Team Championship on the October 23 episode of NXT. Nox and Kai would go on to lose their title match against The Kabuki Warriors (Asuka and Kairi Sane) on the October 30 episode of NXT. Two days later on SmackDown, Nox and Ripley were one of the many NXT wrestlers to invade the show, challenging Mandy Rose and Sonya Deville to a tag-team match, which Nox and Ripley emerged victorious. Later that night, Nox joined Triple H and the rest of the NXT roster as they declared war on both Raw and SmackDown, and vowed to win the Survivor Series brand warfare. Nox was chosen by Ripley to join her team as part of a WarGames match at NXT TakeOver: WarGames. At the event on November 23, Ripley's team would go on to win, however Nox would not take part in the match after Kai turned on her and attacked her. After a short hiatus due to a storyline injury, Nox returned on the January 15, 2020 episode of NXT, competing in a number one contendership battle royal for the NXT Women's Championship, where she was unsuccessful after Kai interfered. On the January 29 episode of NXT, Nox defeated Kai after using a knee brace following interference by Candice LeRae. However, Nox would lose to Kai in a street fight at NXT TakeOver: Portland after interference by the returning Raquel Gonzalez.

It was reported that Newell was replaced in the WWE Mae Young Classic, because of tearing to her ACL before the tournament had even began. Newell returned to the ring on April 13, 2018, at an NXT live event, where she teamed up with Dakota Kai in a tag team match to defeat Reina González and Vanessa Borne. After being announced as a competitor in the 2018 Mae Young Classic, Newell entered the tournament on August 8, under the ring name Tegan Nox, defeating Zatara. Nox returned the following day, defeating Nicole Matthews in the second round before suffering another knee injury in her quarter-final match against Rhea Ripley. After the match premiered on the WWE Network, Nox posted on Twitter that she had suffered numerous injuries during the match, including: a torn ACL, MCL, lateral collateral ligament, meniscus, and patellar dislocation.

Newell debuted for What Culture Pro Wrestling (WCPW) on 27 July at Loaded #5, defeating Bea Priestley, but was defeated by Priestley the following day. On August 24, Newell and Priestley faced off once again, this time in a last woman standing match to crown the first ever WCPW Women's Champion, won by Newell. On 13 February 2017, Newell lost the WCPW Women's Championship to Bea Priestley in a no disqualification match.

In January 2017, Newell embarked on her first tour of Japan, competing with the all-female promotion Stardom. In her first match on the tour, she and Kay Lee Ray defeated Oedo Tai (Kris Wolf and Viper). On 29 January, Newell challenged Kairi Hojo for the Wonder of Stardom Championship, losing after a diving elbow from Hojo.

In April 2017, it was reported that Newell had signed a contract with WWE.

In late 2016, Newell turned into a villainess, abandoning Bayside High and aligning herself with Pete Dunne. In their first match together, Dunne and Newell (dressed as the Suicide Squad iterations of The Joker and Harley Quinn, respectively) defeated Martin Kirby and El Ligero (dressed as Kevin Owens and El Generico, respectively).

Newell debuted for Progress Wrestling on 28 August 2016, defeating Alex Windsor. On November 27, she entered the Natural Progression Series IV Tournament (a single elimination tournament to crown the first ever Progress Women's Champion), defeating Katey Harvey in the first round.

Newell debuted her Luchadora The Explorer character on 24 January 2015, teaming with Brookes in a loss to The Anti-Fun Police (Damian Dunne and Ryan Smile). She competed as Luchadora once again on 14 February, winning a special invitational scramble match. In January 2016, Newell aligned herself with Mark Andrews, forming the extremely popular team known as Bayside High. In their first match as a team, Newell and Andrews defeated #CCK (Brookes and Kid Lykos). Two days later on 3 April, Bayside High became the new Attack: Pro! Tag Team Champions, defeating #CCK. The duo retained the titles until August, when they lost them back to #CCK in a TLC match.

Nixon Newell was the first woman to wrestle at Wolverhampton based promotion, Fight Club: Pro in 2015 where she competed in a 4 way match in the infinity tournament against Chris Brookes, Dan Moloney and Eddie Dennis.

Newell debuted for Attack! Pro Wrestling in July 2014, competing three times on the same show. Firstly she defeated Lana Austin and later in the evening teamed with Austin to defeat Mark Andrews and Pete Dunne to win the Attack! 24/7 Championship for the second time in her career. Later that night, Newell and Austin lost the championship to Mike Bird in a handicap match.

Steffanie Rhiannon Newell (born 15 November 1994) is a Welsh professional wrestler. She is signed to WWE and appears on their NXT brand under the ring name Tegan Nox. Newell previously wrestled on the British independent circuit under the ring name Nixon Newell, most notably for promotions such as Attack! Pro Wrestling, Progress Wrestling, and Fight Club: Pro.