An intergalactic fighting competition between champions of various worlds has traditionally been won by a species much larger and stronger than humans. Entering the contest, a human finds he has to battle against not just his opponents and his self-doubts, but the corrupt system. Far in the future, on a distant space station, the legendary Arena is where the best fighters from every planet come to vie for the championship. But for over half a century, no Earthling has been good enough to be a contender. Until out of nowhere, comes an underdog: the great human hope, Steve Armstrong... and the best anyone's ever seen. He's been training all his life for a shot at the big time, but now he's up against some mighty big muscle: a ruthless extra-terrestrial crimelord who'll pull no punches to make sure he stops Steve dead. In the mood for hard-hitting sci-fi action? Arena will knock you out!

A former pilot rebels against his creator, teaming up with the scientist responsible for android technology, her pet robot Spot, a rough-and-tumble riverboat guide, and a martial arts warrior.

Paul, a computer whiz who spends more time with his machine than with his girlfriend, finds that he has been chosen as a worthy opponent for Mestema, an evil wizard who has spent centuries searching for a challenging foe. After having his computer changed into a wristband weapon, Paul does battle with a variety of monsters before finally coming face to face with the ultimate adversary.

An insurance salesman inadvertently gets trapped after dark in an apartment building that is terrorized by a street gang called "The Vampires."

The citizens of Comet Valley are being taken over by seeds from an alien plant that has taken root there. A sheriff investigates the strange goings-on.