Showcase — DC Comics, National Periodical Publications
Issue: #31
Last valuation update: 2025-12-19
“THE SEA BEASTS FROM ONE BILLION B.C.” John Cook steals Professor Richards’ experimental ray gun, which will turn any normal fish into a large sea monster! Now it’s up to Aquaman and Aqualad to find a way to get these creatures back to normal size!Professor Richards created a machine which could both devolve and evolve sea creatures while placing them under control. John Cook steals it and uses it...
First appearances: John Cook, Professor Richards
Creators: Sheldon Moldoff, Nick Cardy, Jack Miller, Dick Dillin, Jack Schiff
Characters: Aquaman, Tempest, John Cook, Professor Richards