Troy falls asleep, whilst on stand by duty, and dreams of a meeting between him and a group of undersea cavemen who have found the cargo of a crashed ship, the Shenandoah, a vessel which was carrying radioactive material.
Don Mason
Captain Troy Tempest (voice)
Robert Easton
Lieutenant George Lee 'Phones' Sheridan (voice)
Ray Barrett
Commander Sam Shore / Sub-Lieutenant John Horatio Fisher (voice)
Lois Maxwell
Lieutenant Atlanta Shore (voice)
David Graham
Old Caveman / Caveman 1 / Caveman 2 (voice)
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