In this story, Superboy is surprised to find an adult Superman before him. It's not time travel. This newly arrived Man of Steel claims it's all because of Red Kryptonite. The Kents quickly adopt him as a second son, and soon, the two boys are competing to see who will give Ma and Pa the best Anniversary gift. Will it be Superboy's three Superman robots, or Superman's serum that gives the parents super-powers like his? Clark uses a dream projector to confirm it's the latter while they sleep, so when Superman says one of them must leave Earth because the paradox of having the two of them in one spot will make the solar system explode, the teen version of our hero decides it's better if he were the one to go. Let's just ignore the 36-hour time limit on Red K effects for this story, okay? So, big question, on which side of this does Krypto come down?