#1 Kane

When Glenn Jacobs debuted in WWE, it was as "Dr. Isaac Yankem" an evil dentist. Obviously, there wasn't much success. He would also re-debut as Fake Diesel, which turned out to be an even bigger flop.
Thankfully, in the second half of 1997, he would officially re-debut as Kane, The Undertaker's half-brother. His debut is considered by many as the greatest in WWE history.
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His run as masked Kane made him one of the top featured superstars of the Attitude Era and an icon of the business. This was one appearance change that made a bigger difference than many people seem to realize!
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