After this humiliating setback, the Shredder developed a plan to defeat the Turtles by mutating members of the street gang, so that they would have abilities greater than the Turtles'. He and his friend Bebop were voluntarily mutated into evolved animals (though neither was particularly aware of what it would entail) with the promise that it would allow them to exact revenge on the Turtles and gain superhuman powers. He was held down by belts on a laboratory chair, and his DNA was mutated with a rhinoceros kidnapped from the zoo. Rocksteady become a half-man half-rhinoceros. As a result, Rocksteady had the enormous strength of his animal counterparts, with the disadvantage being his appearance. Together with Bebop, the second victim of the experiment, Rocksteady supported Shredder hencefor