Written by Alvin Schwartz, William Woolfolk, and Others Art by Wayne Boring, Stan Kaye, Al Plastino and Others As Superman enters the 1950s, Lex Luthor invents a device that banishes Superman to the fourth dimension, while Mr. Mxyztplk makes the city of Metropolis forget that their hero ever existed. Plus, Superman becomes a super-cowboy and meets a mighty caveman. Collects tales from Action Comics #126-147, Superman #55-65, and WorldÕs Finest Comics #37-47.