After being thrown back in time to Ancient Rome, a 20th century space marshal must reunite with his crew while murderous aliens and violent Romans vie for galactic domination.

After a failed space trade negotiation with Orb the Gargantuan involving sex crystals, our hero, Jack Computer goes out to investigate a small device that's attached itself to the ship. The device transports him back to ancient Rome, where he meets a lovable naive Courtney. Together, they must compete in gladiator battles. Jack's penchant for violence gets Courtney killed and catches the eye of Lord Vicus, a high status Roman official.