Second Legion of Super Heroes issue - December 1959

Legion returns to 20th Century to discredit Superboy, then exile him from Earth because their futurescope shows he's going to turn evil.

Character appearances: Legion of Super-Heroes (Cosmic Boy, Lightning Lad, Saturn Girl); Krypto, Ma and Pa Kent; Sigellian (a new element that's harmful to humans like Kryptonite is to Superboy)

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