In Medieval England Arthur encounters Merlin, whose magic turns out to be early scientific inventions. When Sir Arthur disappears before the tournament, Superboy challenges the Black Knight, who fights him with a red kryptonite mace, which makes Superboy magnetic. This enables him to find Sir Arthur, unmask the Black Knight as Merlin, and help Arthur draw the sword from the stone. Arthur and Merlin reconcile, and the new king marries the Lady Guinevere.; In 1871 Missouri Superboy joins Doc. Langdon's medicine show while he searches for the red kryptonite, meantime foiling crimes by Jesse James. The James gang find the red kryptonite and make bullets to force Superboy to help them, but he is turned into a double of Jesse James, a fact he uses to corral the gang. But a posse chases "Jesse" (Superboy) until Krypto arrives. Superboy uses the red kryptonite to change Krypto to a horse so they can escape until their powers return and they go back to their own time.; Trying to help his science teacher Mr. Larkin, Superboy chases three red kryptonite meteors through the time barrier. In ancient Egypt he helps build a pyramid and forces the pharaoh to stop enslaving his workers. The red kryptonite turns him into a lion-human hybrid, and the workers create the sphinx in his memory.; Super-Turtle rushes into a theater to remove a bomb, but gets interested in the movie instead.