On the May 28 episode of "SmackDown", Mysterio unsuccessfully fought The Undertaker to qualify for the World Heavyweight Championship title match at Fatal 4-Way. The Undertaker suffered a legitimate injury during the match, and a storyline was introduced to explain his absence on television, stating he had been found in a vegetative state by his brother Kane. On the June 4 episode of "SmackDown", Mysterio won a Battle Royal to earn The Undertaker's place at Fatal 4-Way by last eliminating Kane, and went on to defeat Jack Swagger, Big Show, and CM Punk to win the World Heavyweight Championship for the second time. At Money in the Bank, Mysterio defeated Swagger to retain the World Heavyweight Championship, however, Swagger attacked him after the match. Kane, who had won the SmackDown Money in the Bank ladder match earlier that night, cashed in for a title shot and quickly defeated Mysterio to win the World Heavyweight Championship after it had appeared that he was saving Mysterio from Swagger's attack. Kane later blamed Mysterio for The Undertaker's fictional injuries. On the July 23 episode of "SmackDown", Mysterio defeated Swagger in a two out of three falls match to remain the number one contender for the World Heavyweight Championship, earning a title match against Kane at SummerSlam. Kane defeated Mysterio at SummerSlam with a seemingly commemorative Tombstone Piledriver, but the Undertaker returned to exonerate Mysterio and blame Kane.