Showcase Presents Challengers of the Unknown. Volume Two

"Catapulted into world fame by deeds of daring, pilot Ace Morgan, scientist and master skindiver Prof. Haley, circus daredevil Red Ryan, and Olympic wrestling champion Rocky Davis all survived certain death in a plane crash, leading them to form an alliance to tread the paths that others fear, to walk the dangerous road beyond things we know as -- the Challengers of the Unknown! There is no danger, dare or risk these men will not accept! Join in the adventure as four heroes living on borrowed time come up against a host of supernatural, scientific, alien and human menaces on, off, and under the Earth!"--P. [4] of cover.