In the Federal Science Institute, Dr. Jillian O'Hara and her assistant Brian Murphy will demonstrate their research to a commission led by the arrogant Senator Jackson Crenshaw and Dr. Karen Fast from the president office expecting to keep the budget of her laboratory. Colonel Sam Synn is responsible for the security with Lieutenant Rivers and Pvt. Jordan Reid. Dr. O'Hara explains that her machine is the fruit of a long research initiated by her father and can show parallel dimensions. During the demonstration, there is a problem in the device and the room is transported to another dimension with everybody that is observing the experiment. Soon the survivors discover that the room is placed in the wilderness of a dangerous dimension inhabited with wild beasts.

A ship pulls into New York Harbor with no one on board. The police find a cargo full of green pulsating eggs. Upon contact, the eggs explode spreading a green acid like substance that seeps into the skin and explodes. It is later discovered that the eggs are being manufactured in South America by a one-eyed Martian that grew from a tiny seed a former astronaut brought back from a expedition to Mars.

Down these mean streets a man must come. A hero born, murdered, and born again. When a Rookie cop named Denny Colt returns from the beyond as The Spirit, a hero whose mission is to fight against the bad forces from the shadows of Central City. The Octopus who kills anyone unfortunate enough to see his face who has other plans. He's going to wipe out the entire city. The Spirit tracks this cold hearted killer from the city's rundown warehouses, to the damp catacombs, to the windswept waterfront all the while facing a bevy of beautiful women who either want to seduce, love or kill the masked crusader.

Paul Groves (Peter Fonda), a television commercial director, is in the midst of a personality crisis...