Wonder Woman and Professor Calculus develop a super-computer thinking machine that can solve complex problems. But the machine is stolen by Crime-Brain Doone, who intends to use it to steal the gold in Fort Knox.; Needing money to help finance the Gotham Charity Hospital, Green Lantern takes on a series of cases.; After a particularly restless night, Jay Garrick arises one morning to find himself the last man on Earth, thanks to the mistress of the 7th Dimension, Star Sapphire.; Johnny recounts a time in World War II that he was aboard a vessel that was sunk by a Nazi submarine. Now, years later, the sub that sunk his ship has returned to cause trouble to shipping off the coast of Venezuela.