Chino (Dennis Hopper) is the head of the Black Souls, a California motorcycle gang at odds with another crew, the Glory Stompers. One day, Chino and his fellow gang members kidnap the head of the Stompers, Darryl (Jody McCrea), and his girlfriend, Chris (Chris Noel). After a heavy beating, the cyclists abandon Darryl but take Chris with them to Mexico. While Chris faces threats of abuse, Darryl teams up with Smiley (Jock Mahoney), an aging ex-Stomper, for a final showdown with the Souls.