[1] Martin debuted in the World Wrestling Federation (WWF) on the October 25, 1998, episode of Sunday Night Heat as an unnamed bodyguard for the band Mötley Crüe, who were performing on the show.

[7] Test then began an on-screen relationship with Stephanie McMahon that would lead to a "Love her or Leave her" match at SummerSlam on August 22.

Triple H later showed a video which revealed that he had drugged Stephanie and had taken her to Las Vegas, Nevada, where he married her in a drive-through ceremony.

The next week on Raw is War, Triple H would continue to torment him by putting him in a handicap match against the New Age Outlaws, calling it a "Christmas present".

On the January 17, 2000 episode of Raw is War, Test defeated Big Boss Man to win the WWF Hardcore Championship.

At King of the Ring on June 25, T & A were defeated in a Four corners elimination match for the WWF Tag Team Championship by Edge & Christian.

At Fully Loaded on July 23, T & A and Trish Stratus lost to the Hardy Boyz and Lita in a Six-person mixed tag team match.

At No Mercy on October 22, T & A and Trish Stratus competed against the Acolytes Protection Agency (Bradshaw and Faarooq) and Lita, which ended in a no contest because of T & A attacking The APA before the match.

The next day on Raw is War, ECW owner Stephanie McMahon approached Test with the task of beating Chris Jericho after Rhyno failed to do so at SummerSlam.

On the November 1 episode of SmackDown!, Test and Booker T defeated The Rock and Chris Jericho to win the WWF Tag Team Championship.

On the November 12 episode of Raw, Test and Booker T lost the WWF Tag Team Championship to the Hardy Boyz.

[7] On the same night, he won a battle royal which granted him on-screen immunity from being fired for a year after attacking and taking the place of Scotty 2 Hotty.

At No Way Out on February 17, Test and Booker T faced Tazz and Spike Dudley for the WWF Tag Team Championship but failed to win the titles.

The next week, Test defeated Hardcore Holly in a Quarterfinals match but would go on to lose in the semi-finals of the King of the Ring tournament to the eventual winner, Brock Lesnar.

This began by Keibler telling Test he should embrace his fanbase and call them his "Testicles", in line with The Rock's fan group, the "People", Kane's "Kaneanites", Chris Jericho's "Jerichoholics" and Hulk Hogan's "Hulkamaniacs".

This eventually culminated with Test cutting off his long hair and trading his trademark leather pants for normal wrestling trunks.

In May, Test formed a tag team with the returning Scott Steiner, at the request of Keibler, and at Judgment Day on May 18, they faced La Résistance in a losing effort.

On the August 18 episode of Raw, Test defeated Steiner, winning the services of Keibler and announcing his intentions to "make her a whore".

The pair were then fired by Mick Foley (therefore freeing Keibler from their control), who was the on-screen Co-General Manager for two nights, thus finally ending the year-long angle.

On the January 19 episode of Raw, Test competed in a Triple Threat Royal Rumble Qualifying Match against Goldberg and Steiner.

At the Royal Rumble on January 25, Test was found knocked out backstage by some officials and the Raw Sheriff Stone Cold Steve Austin when it was his turn to enter.

Test would gain some revenge on the February 2 episode of Raw, when he and Randy Orton attacked Foley in a backstage area.

On August 27, 2005, Test wrestled at WrestleReunion 2 teaming with The Masked Superstar, Steve Corino, and The Original Evil Clown losing to D'Lo Brown, The Blue Meanie, Tom Prichard and Dusty Rhodes in Philadelphia.

One of his most notable victories during this tenure was against former TNA wrestler Samoa Joe for World Series Wrestling in Australia.

On the September 5 episode of ECW, Test and Mike Knox lost to Rob Van Dam and Sabu in an Extreme Rules Match.

Test was a member of Team Big Show (Big Show, himself, Montel Vontavious Porter, Finlay and Umaga) facing Team Cena (John Cena, Kane, Bobby Lashley, Sabu and Rob Van Dam) at Survivor Series on November 26.

[17] On December 19, 2007, Martin announced that he would embark on a final tour of Britain, Ireland and France in February and March 2008 before retiring from professional wrestling.

[18][25] Police were contacted after a neighbor reportedly realized Martin had been lying motionless on his couch for some time, prompting them to call 911.

It was reported that in August 2008, Martin entered a drug and alcohol rehabilitation center in West Palm Beach, Florida after reaching out to WWE, his former employer, for help regarding his substance abuse.

Forensic pathologist Bennet Omalu later determined that Martin had severe chronic traumatic encephalopathy (CTE), a brain condition caused by repeated concussions and subconcussive head injuries.