It is Spring Break at Manatee Beach and the streets are mobbed with carloads of teenagers from all over the country. Diablo Santor, a head of a viscious motorcycle gang has just been executed. Before dying, he swears to Gail that he did not kill her sister. Later that day the police Chief Strycher is called to the cemetery because Diablo's body has disappeared. Reverend Bates reminds that Diablo vowed that he would come back. On a desert highway a girl is killed by a biker with a dark-visored helmet. The same biker of the mysterious black Harley sadistically murders more innocent college students. While Skip and Gail search for clues to the murder of a friend, discover Diablo's corpse. Gail runs in horror colliding with the killer biker. She pulls off his visor revealing Rev. Bates. He tries to run the couple down but crashes into a bilding and is instantly killed.