A British woman visits her husband at the Mexican mine he is attempting to reopen and discovers that the workers refuse to enter the mine, fearing an ancient curse. The couple enter the mine to prove there is no danger and inadvertently release a demon which possesses people's left hands and forces them to behave in a suitably diabolical manner.
Samantha Eggar
as Jennifer Baines
Stuart Whitman
as Father Cunningham
Roy Jenson
as Mark Baines
Narciso Busquets
as Dr. Julian Rivkin
Erika Carlsson
as Nurse Morgan
Lew Saunders
as Sgt. Leo Matson
José Chávez
as Pepe
Ted White
as Frankie
Haji
as Angela
George Soviak
as Sgt. Needham
Whitey Hughes
as Gambler
Al Jones
as Patrolman Yates
