They were ordered by Shredder to kill Donatello, which they carried out. Rocksteady smashed Donatello's shell with a sledgehammer, leaving the Turtle in a pool of blood. However, Donatello clung to life long enough for his consciousness to be temporarily transferred into the robot Metalhead while his turtle body was being restored. After Shredder's death in issue #50, Bebop and Rocksteady desert the Foot and, after inadvertently coming into contact with Savanti Romero and his stolen Time Scepter, wreak so much havoc across the multiverse that all reality is pushed to the brink of obliteration; the Turtles and their time mistress friend Renet just barely manage to avert that catastrophe.