#4 Zach Gowen
Soon after WrestleMania 19 was done, Mr. McMahon fired Hulk Hogan, who had defeated his boss at The Showcase of the Immortals. Hogan returned as Mr. America, donning a mask this time. He engaged in a feud with Roddy Piper and Sean O'Haire. Piper was hell-bent on revealing the true identity of Mr. America in front of the entire WWE Universe.
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On an episode of The Piper's Pit, Piper and O'Haire launched a brutal attack on Mr. America. The beating was so severe that it rendered the babyface unconscious. It gave Piper an opportunity to unmask the hero, but suddenly a young fan came into the ring to aid Mr. America. The villains attacked him too and Piper pulled off his prosthetic leg in the process, to the fans' astonishment. This is how Zach Gowen made his WWE debut, before a short stint on The Blue Brand.
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#3 Earthquake
Dubbed as one of the most destructive forces of his era, Earthquake debuted in WWE as a fan in November 1989. A strength contest was held between The Ultimate Warrior and Dino Bravo. Bravo's manager, Jimmy Hart, decided to select a fan from the audience and let him sit on the Superstars' backs while they performed push-ups.
Bravo successfully performed the impressive feat, but Warrior was attacked by the 'fan' before he could show off his own raw strength. The fan was a part of Hart's ploy to put down Warrior, and thus Earthquake debuted in WWE.