 Lex Luthor, the world s greatest criminal scientist, has invented a temporal communicator that can contact people from the distant past. He contacts the spirit of Merlin, the wizard of King Arthur s Court, and from Merlin he develops a formula for marbles that can transform him and his henchman "Blinky" McFarlane into innocent-looking children. With this formula Luthor and McFarlane rob the Metropolis Bank, and escape by transmuting themselves into young boys. With Merlin s magic marbles, Luthor and McFarlane pull off ever more audacious robberies - until Luthor overreaches when he tries to rob the Metropolis Branch of the Federal Mint.