Bela Lugosi
Scientist

Lyle Talbot
Inspector Warren

Timothy Farrell
Dr. Alton / Narrator

Dolores Fuller
Barbara

'Tommy' Haynes
Alan / Anne

Charlie Crafts
Johnny (as Charles Crafts)

Conrad Brooks
Banker / Reporter / Pickup Artist / Bearded Drag (as Connie Brooks)

Henry Bederski
Man with Hat and Receding Hairline (uncredited)

Carol Daugherty
Woman in Nightmare (uncredited)

'Captain' DeZita
The Devil / Glen's Father (uncredited)

Helen Miles
(uncredited)

Shirley Speril
Miss Stevens (uncredited)

Amzie Strickland
Minor Role (uncredited)

'Mr. Walter' Hadjwiecyz
Patrick / Patricia (uncredited)

Evelyn Wood
Sheila

Sheila