Boris Karloff

John Gray

Bela Lugosi

Joseph

Henry Daniell

Dr. Wolfe 'Toddy' MacFarlane

Edith Atwater

Meg Camden

Russell Wade

Donald Fettes

Rita Corday

Mrs. Marsh

Sharyn Moffett

Georgina Marsh

Ted Billings

Townsman (uncredited)

Robert Clarke

Richardson a Medical Student (uncredited)

Mary Gordon

Mary McBride (uncredited)

Milton Kibbee

Dan (uncredited)

Bill Williams

Survis, Medical Student

Bobby Burns

Carl Kent

Ethan Laidlaw

Larry Wheat