Damien Demento

American professional wrestler

After The Bushwhackers helped forward a tape of Theis performing an interview, the World Wrestling Federation signed him to a contract. Theis, performing under his Mondo Kleen ring name, debuted in WWF at a live event on October 2, 1992, wrestling Jeff Jarrett in a losing effort. Ten days later, on the October 12 episode of Superstars of Wrestling, Theis made his televised debut under the repackaged ring name and gimmick of "Damien Demento", a villainous character who hailed from "The Outer Reaches of Your Mind" and showed mentally disturbed behavior such as talking to himself. He then proceeded to defeat Steve May in his televised debut match. He made his only pay per view appearance at Royal Rumble as a participant in the 1993 Royal Rumble match. Demento lasted over twelve minutes before being eliminated by Carlos Colón. He also appeared at UK Rampage '93, where he lost to Bob Backlund. After this, Demento competed almost solely on house shows before leaving the WWF in October 1993.

After a stint on the East Coast independent circuit, Theis retired from wrestling in 1994. He made another return to the squared circle in September 24, 2011. This time wrestling as "Mondo Kleen", he defeated Steven Person in a steel cage match at a show that WUW promoted for the Dumbo Arts Festival. On October 29, 2011, Damien Demento defeated long time WUW Trophy Champion "Izzy" Israel Joffe at the WUW October show at Gleason's gym to win the WUW Trophy Championship. On December 10, 2011, Israel Joffe defeated Damien Demento at the WUW December show at Gleason's gym. In 2014, Demento made a few appearances for World Wrestling Organization.