Challengers of the Unknown #31

Prof and Red get caught at gunpoint by the main villain of the issue only to force Prof to bind and gag his friend to a post. Prof soon suffers the same treatment as does Dr. Steuben who’s giant mechanical warrior will soon be in control of the villain who has captured them. Prof and Red’s teammates are completing construction on the giant robot, but as the cover explains to the would-be reader, our heroes are unable to warn them with gags firmly placed.