Issue: #320
Last valuation update: 2026-10-22
Story 1: The Revenge of the Knave From Krypton! Dev-Em returns in the future, but as a reformed villain, working for the side of good. With the help of Dev-Em and Proty II, the Legion of Super-Heroes help defeat a villain. Story 2: Superboy's Switch In Time Superboy is aged to an adult, as well as Lana Lang!
First appearances: Radiation Roy
Creators: George Papp, Sheldon Moldoff, Jerry Siegel, George Klein, Curt Swan, John Forte, Otto Binder, Al Plastino
Characters: Superman, Brainiac 5, Chameleon Boy, Krypto, Lightning Lad, Sun Boy, Element Lad, Saturn Girl, Jonathan Kent, Martha Kent, Lana Lang, Dev-Em, Proty II, Mon-El, Tricksy, Jor-El, Lara Lor-Van, Radiation Roy