Psychomania

Psychomania 1973 is a British horrorcult film starring Nicky Henson, Beryl Reid, George Sanders in his final film and Robert Hardy.

Tom Latham enjoys riding his motorcycle with his girlfriend and loves his mother, but he is no ordinary fellow. He is an amiable teen psychopath, clearly modeled on Alex of A Clockwork Orange fame. Like Alex, he has an unusual pet a frog and a distinctive catch phrase, hello, little green friend.Tom is the leader of a violent teen gang, who ride motorcycles, dabble in black magic and call themselves The Living Dead. In a similar vein, his mother and her sinister butler get their kicks out of holding sances in their home. With her help and following in his fathers footsteps, Tom makes a pact with the devil to return from the dead. One by one, he and his fellow bikers commit suicide with the goal of returning as one of the undead. Several of them fail, but the ones who do return gather together at a secret place called The Seven Witches a circle of standing stones, after which they continue to terrorize the locals. ........

Source: Wikipedia