Zar-Al arrives from the past where he explains that he is on a mission to save Krypton, although his mission fails, he still returns to old Krypton to meet his fate.; Supergirl flies to Superboy's time to see if she can protect her identity and prove to Superman she's ready to be revealed to the world.; Vidal, a Superboy from another planet, takes Superboy's place on Earth while he's away on a space mission.; Trying to prove Mon-El isn't actually Kryptonian, Superboy accidentally exposes him to lead, which both poisons him and returns his memory. He remembers that he is a space explorer from Daxam who visited Krypton, meeting Jor-El and Lara, before arriving on Earth. To save his life, Superboy sends Mon-El into the Phantom Zone until he can cure him of his lead poisoning.; When a space ship crashes outside Smallville, Superboy finds an amnesiac super-powered youth who might be his older brother. He christens him Mon-El and sets him up with a secret identity, but he soon finds evidence that Mon-El is not in fact Kryptonian.; When Kryptonite exposure robs Superboy of his memory, he stumbles into Lana's house and is taken in by the Langs.; Space traveller Dworn is a super weakling under Earth's gravity, however, his power to transmute any element into gold means he is a target for criminals