Gruner grew up in Allentown, Pennsylvania's Lehigh Valley region. He joined WCW and ultimately gained fame as a key member of several strong wrestling factions. In addition to being a member of Raven's Flock, he also was a member of the Filthy Animals and later New Blood. As a member of these factions, Gruner participated in memorable rivalries with top WCW names, including Hulk Hogan, Jeff Jarrett, Rey Mysterio, and others.
In 2000, Gruner appeared in the movie, Ready to Rumble, alongside many other WCW stars.
Kidman turned face after the WCW/ECW Alliance broke up. He went on to capture the Cruiserweight Championship for the seventh time by defeating Jamie Noble at Survivor Series, later Kidman was placed with a new tag team partner, Paul London. The team went on to win the WWE Tag Team Championship from The Dudley Boyz on July 8, 2004.
The champion run of this Face team came to an abrupt end after Kidman turned his back on London, leaving him to wrestle a tag team title match on his own. The heel Turn came off the back of a legitimate injury on an August 24, 2004 taping of SmackDown!, where Billy Kidman's Shooting Star Press caused Chavo Guerrero to suffer a concussion and be taken to the hospital.
The pair fought at No Mercy, where Kidman injured London with a shooting star press, while London was strapped to a stretcher. When Chavo returned, he faced off with Kidman in a storyline resulting from the injury.
Gruner was released from his WWE contract on July 7, 2005.
During this first tour of the UK since leaving WWE, Kidman would make a few appearances in independent British promotions. Other than his notable Frontier Wrestling Alliance 3-way match with Jodie Fleisch and Jonny Storm, Kidman would also wrestle British wrestling legend Robbie Brookside in a losing effort during a British rules match to determine the first Real Quality Wrestling Heavyweight Champion.
While in England, Gruner gave an interview to The Sun, a London-based tabloid newspaper, in which he said that he was interested in wrestling for TNA. In the course of the interview, Gruner claimed that he was fired from WWE for criticizing the company's decision to downgrade wrestlers from business class to economy class in overseas flights. After returning to the United States, Kidman wrestled a dark match, while wearing a mask, before a WWE show in July 2006.
- Signature Moves
- BK Facebuster (Dragon Sleeper Facebuster)
- Fireman's Carry Neckbreaker
- Suicide Dive
- Legscissors Takedown
- Diving Elbow Drop
- Multiple Kick Variations
- Big Boot (as a counter to an opponent coming towards the turnbuckle)
- Tag teams and stables
- Wrestlers trained
- Theme music
Championships and accomplishments
- WSW Heavyweight Champion (1 time)