David Carradine romps around in a loin-cloth as Kaz Oshay, a good-guy biker who hops on his destructocycle to participate in a sport to the death, in Roger Corman's futuristic gladiator motorcycle film. The film takes place 1000 years after the "Neutron Wars" have decimated civilization, except for pockets of domed cities. Surrounding the cities are vast wastelands called "ranges." Kaz is a "ranger guide" who roams the range riding horses and wielding sabers. The sabers are necessary to fend off the "Statesmen" -- roving hordes under the thrall of Lord Zirpola (David McLean). Zirpola captures Kaz and throws him into a cell, where he meets Deneer (Claudia Jennings), who tells Kaz that a group of mutants have abducted her daughter. Kaz and Deneer escape and set off in search of her daughter as they dodge the Statesmen and their high-decibel motorcycles called "Death Machines." Kaz is finally forced to participate in the "Death Sport" -- a mad free-for-all inside a tunnel in which only one contestant can emerge alive.