As Damien Demento, Theis wrestled in the main event of the first episode of WWF Monday Night Raw on January 11, 1993, losing to The Undertaker.
[5] After The Bushwhackers helped forward a tape of Theis performing an interview, the World Wrestling Federation signed him to a contract.
[4] 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.
[6] 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.
Demento was notable for his appearance in the main event of the debut episode of Monday Night Raw on January 11, 1993, where he was defeated by The Undertaker.
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.