The Undertaker's next feud started the next night on "Raw", when Mankind made his debut and interfered in Undertaker's match against Justin "Hawk" Bradshaw. For the next few months, Mankind ambushed and cost The Undertaker several matches. The feud intensified and they began taking their battles into crowds, backstage areas and in the boiler rooms of different arenas. Mankind cost The Undertaker the WWF Intercontinental Heavyweight Championship at , assisting champion Goldust to victory. As a result, the first-ever Boiler Room Brawl was booked between the two at SummerSlam. After 20 minutes of brawling with Mankind in the Cleveland Gund Arena's boiler room, the arena corridors and the entrance ramp, the Undertaker reached for Paul Bearer's urn to take the win, but Bearer hit him with it, betraying The Undertaker and allowing Mankind to "incapacitate" him with the mandible claw, giving him the win. After Bearer's betrayal, The Undertaker took his rivalry with Mankind to a new level, resulting in a Buried Alive match in the main event of , where The Undertaker won the match after a chokeslam into the open grave. However, after interference from The Executioner, as well as the help of several other wrestlers, Mankind escaped the grave and shovelled dirt onto The Undertaker, was ultimately resulting in him being "buried alive".