Nikki Cross

In September 2008, Glencross began training at the Scottish Wrestling Alliance, where she made her debut for the promotion, performing under the ring name Nikki Storm. In February 2010, she began working on the British independent circuit, and became a mainstay for promotions such as her debuting at the Insane Championship Wrestling (ICW), and Pro-Wrestling: EVE, where she held the Pro-Wrestling: EVE Championship three times. In 2013, Storm began touring in Japan with JWP Joshi Puroresu, and made some appearances for World Wonder Ring Stardom until the middle of the summer of 2015. In October 2013, Storm began wrestling for American all-female promotions Shimmer Women Athletes, Shine Wrestling and Women Superstars Uncensored. She has also wrestled for Global Force Wrestling (GFW), Absolute Intense Wrestling (AIW), World Wide Wrestling League (W3L), Queens of Combat, and World Xtreme Wrestling.

Glencross competed in Total Nonstop Action Wrestling (TNA)'s British Boot Camp 2, which began airing in October 2014, in which she was unsuccessful.

Glencross received a tryout with WWE in London during the autumn of 2015, and in April 2016, she was one of ten signees that had begun training at the WWE Performance Center in Orlando, Florida. She debuted for NXT on 22 April, during a live event. During a Facebook live video in August, she was introduced as Nikki Cross. She made her first televised appearance and in–ring debut on 17 August episode of NXT under the name "Nikki Glencross", where she competed in a six-woman tag team match along with Carmella, and Liv Morgan, defeating Daria Berenato, Mandy Rose, and Alexa Bliss.

On 11 January 2017 episode of NXT, Cross came to the aid of NXT Women's Champion Asuka, who was being attacked by Peyton Royce and Billie Kay, before turning on Asuka and attacking her as well. As a result, Cross, Royce and Kay were placed in a four-way match at the NXT TakeOver: San Antonio event on 28 January, which Cross failed to win. In May, Cross participated in a number one contender's battle royal for Asuka's NXT Women's Championship, where she, Ruby Riot, and Ember Moon were attacked by Asuka for being the last competitors left in the match and as a result, all four of them were placed into a four–way championship match at NXT TakeOver: Chicago, which was later changed to a three–way match after Ember Moon suffered an injury. At the event, Cross failed to capture the title. In a rematch which was contested in a three–way elimination match once again against both women, Riot was the first eliminated before the match ended in a no contest as Cross and Asuka brawled backstage. This led to a last woman standing match (the first ever in WWE history) between the two women for the NXT Women's Championship on 28 June episode of NXT, in which Cross was once again defeated. On 19 August at NXT TakeOver: Brooklyn III, Cross accompanied and helped Sanity to capture the NXT Tag Team Championships from The Authors of Pain. In October, Cross earned herself a spot for the fatal four–way match for the vacant NXT Women's Championship at NXT TakeOver: WarGames on 18 November, which was ultimately won by Ember Moon.

In early 2018, Cross began a little winning streak, defeating Lacey Evans and Vanessa Borne. During the 2018 Superstar Shake-up her fellow stable partners Eric Young, Alexander Wolfe and Killian Dain were drafted to SmackDown, leaving Cross on NXT to work again as a singles competitor. Throughout the summer, Cross started a feud with Shayna Baszler over the NXT Women's Championship, which led to a match between the two at NXT TakeOver: Chicago, in which Cross was once again unsuccessful and was defeated by technical submission. After a short hiatus, Cross returned in August and she was placed in the Aleister Black attack storyline where she was revealed to be a witness as she was on the roof of the building at the time he was attacked. In September, Cross also started a short feud with Bianca Belair which led to a match between the two that ended in a double count–out. One month later, on 17 October episode of NXT, a rematch ended in a no contest, after Aleister Black returned and interrupted it to ask Cross who his attacker is. Johnny Gargano was eventually revealed as the attacker and her involvement in the storyline sparked a match between Cross and Gargano's wife Candice LeRae, whom she was able to defeat in a singles match at NXT TakeOver: WarGames. Cross wrestled her final match on 9 January 2019 episode of NXT, where she lost to Bianca Belair, officially ending the feud between the two as well.

On 6 November 2018 episode of SmackDown from Manchester, England, Cross made her surprise main roster debut by answering an open challenge from WWE SmackDown Women's Champion Becky Lynch, who defeated her in a non-title match. On 17 December 2018 episode of Raw, Cross was advertised as one of the six NXT wrestlers about to be moved to the main roster. On 14 January 2019 episode of Raw, Cross made her Raw debut, teaming with Bayley and Natalya in a winning effort against The Riott Squad (Liv Morgan, Ruby Riott and Sarah Logan).

On 17 January 2019, Glencross married her longtime boyfriend and former Sanity stablemate, Damian Mackle, better known as Killian Dain.

Although drafted separately instead of as a team during the 2019 WWE Draft, Cross and Bliss remained on Raw, but the team was then traded to SmackDown. Cross made an immediate impact on the brand, winning a match to earn a future shot at the SmackDown Women's Championship. On 1 Nov episode of SmackDown, Cross unsuccessfully challenged Bayley for the SmackDown Women's Championship due to interference from Sasha Banks. A week later on 8 Nov episode of SmackDown, Cross lost to Banks via submission. Cross got announced that she would be on Team SmackDown at Survivor Series along with Banks, Carmella, Lacey Evans, and Dana Brooke. At Survivor Series, Cross was the first woman to get eliminated and Team SmackDown would go on to lose that match. On the SmackDown after Survivor Series, Bliss would return and save Cross from an attack by Fire n' Desire after Cross defeated Rose. At WrestleMania 36 Cross and Bliss won the WWE Women's Tag Team Championships for the second time by defeating The Kabuki Warriors. They lost the titles against Bayley and Sasha Banks on Smackdown. On 19 June 2020 episode of SmackDown, Cross attacked WWE Women's Tag Team Champions Bayley and Sasha Banks, which led to a match between Cross and Banks that Cross lost. The following week, Cross won a fatal four-way match to earn a SmackDown Women's Championship match against Bayley at The Horror Show at Extreme Rules. At the event Cross lost the match when Bayley hit Cross with the Sasha Banks Boss Time brass knuckles. On 24 July 2020 episode of SmackDown, An irate Cross demanded a rematch for the SmackDown Women's Championship. Bayley agreed to the rematch, however, Bayley stated that Cross must defeat a worthy adversary in Bliss, setting up a match between Bliss and Cross where the winner would face Bayley for the title on the following week's SmackDown. Cross defeated Bliss to earn a rematch. On 31 July 2020 episode of SmackDown, Cross shoved Bliss onto the floor after losing a SmackDown Women’s Championship match against Bayley. Bliss was attacked by The Fiend Bray Wyatt.

Behind The Scenes Of WWE Superstar Shakeup (VIDEO)

WWE has posted a video on YouTube giving fans a backstage look at the WWE Superstar Shakeup with live reactions from superstars.