Concurrent to the deep, dark secret storyline directed by Bearer, Undertaker began a new rivalry at SummerSlam when special guest referee Shawn Michaels accidentally hit The Undertaker with a steel chair shot meant for Bret Hart, costing Undertaker the WWF Championship. After a double count-out draw during , Undertaker challenged Michaels to the first Hell in a Cell match at . During this match, The Undertaker's storyline half-brother Kane finally made his debut under the control of Paul Bearer, ripping off the door to the cell and giving The Undertaker a "Tombstone Piledriver", Undertaker's trademark finisher, allowing Michaels to pin him. As the storyline progressed through Bearer, Kane challenged The Undertaker, but Undertaker consistently refused to fight his half-brother. The Undertaker's final encounter with Michaels was in a casket match for the WWF Championship at the Royal Rumble. The week before on "Raw", Kane had seemed to ally with his brother against Michaels' D-Generation X; however, at the Royal Rumble, Kane trapped him in the coffin, padlocking the casket lid and setting it ablaze which again gave Michaels the victory. The Undertaker, however, had disappeared when the casket lid was reopened. After a two-month hiatus, The Undertaker returned and defeated Kane at WrestleMania XIV. The two had a rematch, the first-ever Inferno match, one month later at , which The Undertaker won by setting Kane's right arm on fire.