Kane's Debut: Tearing Off the Hell in a Cell Door (1997)
At Badd Blood 1997, during the first-ever Hell in a Cell match between The Undertaker and Shawn Michaels, the arena went dark. Kane walked to the ring, tore the cell door off its hinges, and delivered a Tombstone to his storyline brother, costing the Undertaker the match. It remains one of the most effective debuts in wrestling history.
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What happened
The debut paid off more than a year of storyline seeds about The Undertaker's younger brother, presumed dead in a fire. When Kane finally appeared, the character was fully formed: the mask, the red and black, the silence, and the immediate physical dominance.
The moment also protected Shawn Michaels, who advanced from the first Hell in a Cell to his WrestleMania path, while launching a brother-versus-brother feud that ran for years. It is a textbook example of a debut that needed no explanation to land.