The ranks of a Satan-worshiping biker gang known as the Grave Diggers are being thinned out by a mysterious assailant. Enter Stone (Ken Shorter), an undercover cop who's just hairy and bedraggled enough to pass for one of the hell-raisers. Exploitation thrills come at full throttle in this infamous Australian cult classic. Director/co-writer Sandy Harbutt, Hugh Keays-Byrne, Helen Morse, Vincent Gil also star. 99 min. Widescreen (Enhanced); Soundtrack: English. Reion Free