Adventure Comics Vol.1 #303
Superboy helps his physical double, the Prince of Sardonia, foil a potential usurper to the throne. The newest Legionnaire, Matter-Eater Lad, is accused of being a spy.
Printed: Dec 1962
Writers: Leo Dorfman and Jerry Siegel
Art: George Papp and John Forte
Cover: Curt Swan and George Klein