A mysterious hypnotist reverts his beautiful assistant back into the form of a prehistoric sea monster that she was in a past life.
Chester Morris
as Dr. Carlo Lombardi
Marla English
as Andrea Talbott / Elizabeth Wetherby
Tom Conway
as Timothy Chappel
Cathy Downs
as Dorothy Chappel
Lance Fuller
as Dr. Ted Erickson
Ron Randell
as Police Lt. Ed James
Frieda Inescort
as Mrs. Chappel
Frank Jenks
as Plainclothes Sgt. with Lt James
El Brendel
as Olaf, the butler
Paul Dubov
as Johnny, the barker
William Hudson
as Bob, the ex-fiancé
Flo Bert
as Marta, the Maid
