- Ralph Bellamy
- Ellery Queen
- Margaret Lindsay
- Nikki Porter
- Charley Grapewin
- Insp. Queen
- James Burke
- Sgt. Velle
- Michael Whalen
- Dr. James Rogers
- Marsha Hunt
- Barbara Braun
- Fred Niblo
- John Braun
- Charles Lane
- Dr. Prouty
- Ann Shoemaker
- Lydia Braun
- Marion Martin
- Cornelia
- Douglas Fowley
- Rocky Taylor
- Morgan Wallace
- Zachary
- Byron Foulger
- Amos
- Katherine DeMille
- Valerie Norris
- Peter Bronte
- Doctor's Assistant
- Jack Cheatham
- Desk Sergeant
- Jimmy the Crow
- The Raven
- Alan Ladd
- Elevator Passenger
- Arthur Millett
- Elevator Guard
- Frank O'Connor
- Ambulance Driver
- Lee Phelps
- Flynn
- Jack Rice
- Rogers' Assistant
