Efrem Zimbalist Jr.
Stuart Bailey (41 eps)
Edd Byrnes
Gerald Lloyd "Kookie" Kookson III (41 eps)
Roger Smith
Jeff Spencer (41 eps)
Jacqueline Beer
Suzanne Fabray (41 eps)
Louis Quinn
Roscoe (41 eps)
Ellen Burstyn
Betty Benson (1 eps)
Kent Smith
Robert Vincent (1 eps)
Roberto Contreras
Santos (1 eps)
Chick Chandler
Eddie Carlisle (1 eps)
Majel Barrett
Ilsa Grosch (1 eps)
Margaret Hayes
Connie Lansing (1 eps)
Jay Novello
Yegor Danilov (1 eps)
Elaine Devry
Jennie Day (1 eps)
Grady Sutton
Doorman (1 eps)
Norma Varden
Mrs. Hotchkiss (1 eps)
Belle Mitchell
1st Harpy (1 eps)
Wynn Pearce
Henry Walden (The Hermit) (1 eps)
Dyan Cannon
Kathy (1 eps)
Charles Seel
George McHenry (1 eps)
Herb Vigran
Photographer (uncredited) (1 eps)
Alberto Morin
Inspector Fayolle (1 eps)
Don Barry
Frank Sully (1 eps)
Lester Matthews
Mr. Craythrope (1 eps)
Andrew Duggan
Insp. Eric Sommers (1 eps)