Challengers of the Unknown (Volume 1) with a cover date of May, 1960.
Synopsis for "The Prisoner of the Tiny Space Ball"
When a prisoner from an alien world lands on Earth, the Challengers recapture it and help out the people of the world Ak-Sel crush an evil opposing army. After defeating the planets oppressors, the Challengers are returned home.
Appearing in "The Prisoner of the Tiny Space Ball"
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Synopsis for "The Creatures From the Past"
While out on an expedition with June Robbins, Rocky finds a golden fleece that creatures real live creatures of Greek mythology. After fighting each one, and Rocky himself, June (Disguised as a mermaid) manages to douse Rocky in a formula that reverses the fleeces power.
Appearing in "The Creatures From the Past"
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See Also