Amateur athletes (and their girlfriends) are kidnapped from around the world and brought to the secret subterranean desert lair of "Queen" Diana, to be trained to fight to the death in gladiatorial matches.
Rich gamblers attend the matches, placing their wagers on the fighters electronically. Diana presides over the fights from her throne and takes a big cut in the purse.
A twisted megalomaniac, Diana tolerates no arguments from the men in training nor the girls who are pooled into a harem for the men. She beds down with some of the winners, promising their freedom by continuing to win the death fights, but no one has ever achieved that goal.
A young couple finally escapes into the desert, pursued by Diana in her machine-gun equipped ultra light aircraft.
4 clips of the evil Diana (Erika Nann) including her demise: https://www.youtube.com/watch?v=S4bi3sYfHVI&list=TLZg4Y1ezci2MwMzA5MjAxNg&index=4