After being snubbed before a weekend-getaway by his teaching assistant, socially awkward professor of history Tarl Cabot accidentally unlocks the magical properties of a ring which transports him to the planet Gor.
After his arrival, Cabot encounters a village being attacked by the army of the tyrannical priest-king Sarm (Oliver Reed). Sarm’s forces are invading neighboring settlements in an effort to retrieve the Home Stone, a mystical object that creates pathways between Gor and distant Earth. Cabot too is abruptly attacked by Sarm’s warriors.
After inadvertently killing Sarm’s own son during the encounter, he is left for dead in the desert. He awakens to find himself being nursed back to health by Talena (Rebecca Ferratti), a scantily clad barbarian princess of the Kingdom of Ko-ro-ba…
Cabot learns that Talena’s father, the King, has been captured by Sarm, along with the Home Stone. Cabot travels with Talena on a rescue mission to Sarm’s lands, where they are captured. Cabot leads a group of rebels in an escape effort, whereupon Cabot is able to kill Sarm, rescue Talena and her father, and reacquire the Home Stone. Tarl et al. return to Ko-ra-ba, where, after Cabot and Talena admit their love for one another, Cabot accidentally activates the Home Stone, and is returned to Earth.