Superboy in "Lex Luthor and Clark Kent: Cell-Mates!"
After Jonathon Kent, a member of the parole board, refuses to parole Lex Luthor. Luthor frames Clark, who ends up in prison as Lex's cellmate. Superboy and Krypto eventually get Lex to confess.
An untitled Homer strip.
The Legion of Super-Heroes in "The Secret Origin of Bouncing Boy"
*In order to lift the spirits of a group of prospective Legion applicants, Bouncing Boy tells them of his origin, and of the difficulties he faced in trying to convince the Legion that he was worthy of membership. The Legionnaires initially believed his power was worthless, and he failed in his various attempts to convince them otherwise, until he was able to catch a thief with an electrical weapon by bouncing to avoid being shocked. *Source: The Official Legion of Super-Heroes Index #2 - Published by ICG.
(1st Chronological Appearance of Matter-Eater