In this "DC Giant G-88" Superman and Batman have strange alien encounters! The Secret of the Captive Cavemen (Superman, Batman and Robin, Carter Nichols / written by Bill Finger : reprinted from: World's Finest Comics #138) Can Superman and Batman rescue cavemen from aliens? The Creature That Was Exchanged for Superman (Superman, Batman and Robin / written by Jerry Coleman : reprinted from: World's Finest Comics #118) Can Batman figure out why Superman and an alien creature exchanged places on different planets? Riddle of the Four Planets! (Superman, Batman and Robin, Commissioner Gordon / written by Jerry Coleman : reprinted from: World's Finest Comics #130) In order to defeat a starfish monster that is terrorizing Gotham City, Batman must gather ingredients from four planets. The Mirror Batman (Superman, Batman and Robin / written by Jerry Coleman : reprinted from: World's Finest Comics #121) Batman falls into a mirror and he comes out looking like a funhouse reflection. How can he turn back to normal?