After making two dark-match appearances under his real name in March 1989, Tenta joined the WWF full-time in September 1989. In his first match after signing on, a dark match on September 21, 1989, he portrayed a lumberjack character named Earthquake Evans that was billed as being from the "Northern Yukon Territory" who was managed by Slick, and defeated Paul Roma. Tenta then made his WWF television debut on the November 11, 1989, edition of "WWF Superstars of Wrestling", where he was planted in the audience as a normal spectator at the taping held in Wheeling, West Virginia. During an in-ring interview with Gene Okerlund, Dino Bravo challenged The Ultimate Warrior to a strength competition. In order to demonstrate, Bravo and manager Jimmy Hart suggested that they pick a random audience member to come into the ring and sit on the backs of Bravo and the Ultimate Warrior as they did push-ups to see who could do the most. The Ultimate Warrior agreed, and Hart, after pretending to look around the audience, centered his attention on the very large Tenta who was sitting in the audience in casual clothing and appearing surprised. Tenta came down into the ring, identified himself as "John from West Virginia" and proceeded to sit on Bravo's back as he did a set of push-ups. During the Ultimate Warrior's set, however, Tenta leapt down onto the prone Ultimate Warrior using a seated senton that was adapted to be his signature move. Bravo and Tenta then beat and unleashed multiple big splashes on the prone Warrior. Both then celebrated as Tenta was inaugurated into the WWF as a heel with Hart as his manager. Tenta was pushed as The Canadian Earthquake – and by WrestleMania VI, simply Earthquake – an unstoppable monster heel who often sent his opponents out on a stretcher after repeatedly hitting them with his sitdown splash.