World's Finest Vol. 1 (1941-1986) #77

Argumento

Superman and Batman are both on the trail of Prof. Pender, a criminal genius. But when they find him, Pender exposes Superman to a "decharging ray," which takes away his powers, and Batman accidentally steps in front of Pender's activated super-charging machine, giving him super-powers. While Superman and Batman adjust to their new abilities, they track down Pender and stop him from re-creating his super-charging ray and using it on himself.