Paul Lavond is framed for murder and robbery by his associates and sent to the Devil's Island. Years later, when Paul escapes with the help of a scientist, he vows vengeance on his associates.
Ben Harris and Harold Tufnell-Jones are rescuers and British nationals who do their best to rescue a woman from Sir Hugh, the captain of an underwater establishment.
When Akir, a peaceful planet, is attacked by a warlord, Sador, and his army of mutants, Shad, a young Akira farmer, recruits a group of mercenaries to protect his planet.