[1] Sierra has worked for Puerto Rico's World Wrestling Council (WWC) since 1985, as both a wrestler and a backstage worker.
Their identities were revealed on-air on the live Main Event pre-show of Clash of the Champions XXXI, when they were unmasked by The Nasty Boys following a match.
Under the name 'Fidel Sierra', he made his first appearance on the February 5, 1994 episode of WWF Superstars, teaming with Barry Horowitz in a loss to The 1-2-3 Kid and Marty Jannetty.
He then teamed with Ricky Santana in two tryout matches at WWF TV tapings that June, though the pair was not signed.
Sierra would make two more appearances on WWF television in 1995 as 'David Sierra', losing to Aldo Montoya on the January 30 episode of Monday Night Raw and once again teaming with Barry Horowitz to lose to Men on a Mission on the February 9 edition of WWF Wrestling Challenge.