- Humphrey Bogart - Doktor Walter Garrett
- Rosemary Lane - Joan Ellwood
- Wayne Morris - Ross Kendrick
- Dennis Morgan - Doktor Ted Steele
- John Litel - Doktor Francis Flegg
- Olin Howlin - Doktor Bill Carrington
- Marguerite Chapman - Alice, sekretarka Rossa
- Huntley Gordon - Doktor Gibbs
- Charles Wilson - Doktor Wells