Jimmy summons Superman to Africa with his signal-watch when he encounters a gorilla with super-powers. Superman deduces that the giant ape is from Krypton, and later it sacrifices itself to save Superman from Green Kryptonite, revealing that it was really a Kryptonian human accidentally transformed into a gorilla.; Tommy Tomorrow checks out Prof. Jaxon's dimension cabinet, a gateway to the 4th dimension. Since Tommy suspects the cabinet is a hoax, he volunteers to test the device and is sent to the 4th dimension. But Tommy doesn't realize that he has fallen for the real plot of the professor, who actually wanted to get rid of him. When Tommy realizes that things happen a day later in the 4th dimension, Tommy takes the place of that world's Tommy Tomorrow in testing that world's dimension cabinet and returns to arrest the professor and his accomplice.; Congo Bill must deal with a man on his safari who learned everything he knows about the jungle from a correspondence course.