On the June 4 episode of "SmackDown", Kane stated he had found his brother The Undertaker in a "vegetative state" over Memorial Day weekend and vowed revenge on whoever was responsible. Due to Undertaker's injury, a battle royal was held to determine his replacement for Fatal 4-Way, which Rey Mysterio won by last eliminating Kane. Mysterio would go on to win the match at Fatal 4-Way. Kane participated in his fourth Money in the Bank ladder match at its first eponymous pay-per-view. He won the match, and cashed in his Money in the Bank contract later that night, defeating Rey Mysterio (who had just defeated Jack Swagger) to win the World Heavyweight Championship, thus making Kane the first wrestler in WWE history to win the WWE Championship, the ECW Championship, and the World Heavyweight Championship. He became the first wrestler to cash in the Money in the Bank contract on the same night it was won and also holds the record for the fastest cash in at 47 minutes. On the next "SmackDown" on July 23, Kane accused Mysterio of putting The Undertaker in a vegetative state; Mysterio countered the accusations, claiming that Kane himself was the perpetrator. At SummerSlam, Kane retained the World Heavyweight Championship against Mysterio, and following their match, The Undertaker appeared. Kane was revealed as The Undertaker's attacker, thus turning heel and reigniting their feud. He successfully defended the World Heavyweight Championship against The Undertaker in a No Holds Barred match at Night of Champions. On the following episode of "SmackDown", a casket was brought to ringside by druids to reveal the return of Paul Bearer, supporting The Undertaker. At Hell in a Cell, Bearer turned on The Undertaker and allied himself with Kane, who retained the World Heavyweight Championship in a Hell in a Cell match with Bearer's help. At Bragging Rights, Kane defeated Undertaker in a Buried Alive match after help from The Nexus to retain the title once again, thus ending their feud.