Boris Karloff as Dr. Julian Blair

Richard Fiske as Dr. Richard Sayles

Amanda Duff as Anne Blair

Anne Revere as Mrs. Walters

Dorothy Adams as Mrs. Marcy

Walter Baldwin as Seth Marcy

Kenneth MacDonald as Sheriff Ed Willis

Shirley Warde as Helen Blair

Cy Schindell as Karl

Ernie Adams as Elam

Lester Allen as Dr. Van Den

Wheaton Chambers as Dr. Sanders

Eddie Kane as Professor Walt

Harrison Greene as Mr. Booth

Erwin Kalser as Professor Kent

John Tyrrell as Postmaster