Edward G. Robinson

as Professor Richard Wanley

Joan Bennett

as Alice Reed

Raymond Massey

as Dist. Attorney Frank Lalor

Edmund Breon

as Dr. Michael Barkstane

Dan Duryea

as Heidt / Tim, the Doorman

Thomas E. Jackson

as Inspector Jackson

Dorothy Peterson

as Mrs. Wanley

Robert Blake

as Dickie Wanley