- Gene Barry
- Dr. Frank Addison
- Lydia Clarke
- Martha Addison
- Michael Moore
- Russ Farley
- Nancy Gates
- Ellen Haskell
- Lee Aaker
- Tommy Addison
- Milburn Stone
- Insp. Harold Mann
- Bert Freed
- Emil Jablons
- Frank Cady
- FBI Agent George Weinberg
- Houseley Stevenson Jr.
- 'Greg' Gregson
- Leonard Strong
- Donald Clark
- Jerry Hausner
- John Pattiz
- John Damler
- Dr. Peter Rassett
- George Lynn
- Robert Kalnick
- Olan Soule
- Mortie Fenton
- Anthony Warde
- Arnie Molter
- Don Brodie
- FBI Agent
- Norman Budd
- David Rogers
- Mary Carroll
- Marion Fenton
- James Conaty
- Man in Hotel Lobby
- Joe Dominguez
- Barber
- Bonnie Kay Eddy
- Peggy Marston
- Dick Elliott
- Prize-Drawing MC
- Tommy Farrell
- Baseball Game Usher
- Roy Gordon
- Chief Inspector
- Greta Granstedt
- FBI Agent
- Thomas Browne Henry
- Projection Room Speaker
- Michael Jeffers
- Baseball Game Spectator
- Paul Lees
- Davis -- FBI Man
- Louis Lettieri
- Sydney Fenton
- Mike Mahoney
- Uniformed Cop
- William Meader
- FBI Agent Smitty
- Joseph Mell
- Dr. Gus Schwambach
- Harold Miller
- Dr. Hodgins
- Lee Miller
- FBI Agent in Car
- Hans Moebus
- Henry
- Ralph Montgomery
- Hot Dog Vendor
- Mary Murphy
- Young Woman Buying Stamps
- Cosmo Sardo
- Hotel Barber
- Jeffrey Sayre
- Man at Table at Dance
- Charles Sherlock
- Baseball Game Spectator
- Bert Stevens
- FBI Agent
