Captain Midnight (40 episodes, 1954-1956)
Ichabod 'Ikky' Mudd / Ichabod 'Izzy' Mudd / Ichabod 'ikky' Mudd (32 episodes, 1954-1956)
Aristotle 'Tut' Jones / Aristotle 'tut' Jones (30 episodes, 1954-1956)
Ilenka / Police Lieutenant / Schnoble / Shook (4 episodes, 1954-1955)
Krause / Marlowe / Rice (3 episodes, 1954)
Bart / Gaynor / Rocky Billings (3 episodes, 1954-1955)
Ditmars / Swami Yagora (3 episodes, 1954-1955)
Dr. Morelli / Harga / Mannlciher (3 episodes, 1954-1955)
Kovac / Lorenz / Roush (3 episodes, 1954-1955)
Jimmy Gibson / Low Foley (2 episodes, 1954-1956)
Dr. Hamilton / Professor Gamble (2 episodes, 1954-1955)
Jefferson Bishop / Ram Das (2 episodes, 1954-1955)
Pete Hardy / Volney (2 episodes, 1954-1955)
Clem / Uncle Cyrus (2 episodes, 1954-1955)
Landru / Loutrelle (2 episodes, 1954-1955)
Ricker / Snyder (2 episodes, 1954)
Kalyan Singh / Pedro (2 episodes, 1955-1956)
Mrs. Hoffner / Mrs. Radnor (2 episodes, 1955)
Jones / Morton (2 episodes, 1954)
Frank Adams / Steve Darby (2 episodes, 1954-1955)
Branko Pravelic / Zarca (2 episodes, 1954-1955)
Gladys Murphy / Sally Jensen (2 episodes, 1955)
Big Vic / Volmer (2 episodes, 1954-1955)
Henderson / Kroll (2 episodes, 1954)
Hobson / Major (2 episodes, 1955)
Gorley / Linden (2 episodes, 1955)
Mr. Hoffner / Professor Edwin Genner (2 episodes, 1955)
Goronov / Van Ronk (2 episodes, 1954-1955)
Ling / Ohuma (2 episodes, 1954)
Bass / Knife Seller (2 episodes, 1955)
Fred Connors (2 episodes, 1955-1956)
Bates / Harris (2 episodes, 1955)
Eve Gamble (1 episode, 1954)
Professor Bergland (1 episode, 1954)
Jimmy Sawyer (1 episode, 1954)
Derek Strange (1 episode, 1954)
Jimmy Roberts (1 episode, 1954)
Martha Stanhope (1 episode, 1954)
Preston (1 episode, 1954)
Dr. Morgan (1 episode, 1954)
Hi Foley (1 episode, 1954)
Walter Kurt (1 episode, 1955)
Bengra Tassi (1 episode, 1955)
Helen Orloff (1 episode, 1955)
Mrs. Felicia Woodman (1 episode, 1955)
Davis (1 episode, 1955)
Stefan (1 episode, 1955)
General Tetley (1 episode, 1955)
Jerry (1 episode, 1955)
Frank White (1 episode, 1955)
John Sawyer (1 episode, 1954)
George Maynard (1 episode, 1954)
Incana (1 episode, 1954)
Lisa (1 episode, 1954)
Dr. Ormond (1 episode, 1954)
General Howard (1 episode, 1954)
Sutoc (1 episode, 1955)
Carlos Perez (1 episode, 1955)
Billy Orloff (1 episode, 1955)
John Cabot Kingsley (1 episode, 1955)
Mr. Jensen (1 episode, 1955)
Bob Hansen (1 episode, 1955)
Kisano (1 episode, 1955)
Zorac (1 episode, 1955)
Mrs. Drexel (1 episode, 1956)
Percy (1 episode, 1954)
Hank Rogers (1 episode, 1954)
Roselli (1 episode, 1954)
James Van Dirk (1 episode, 1954)
Vornbolt (1 episode, 1954)
Dr. Vronik (1 episode, 1954)
Mr. Terhune (1 episode, 1954)
Mileaway (1 episode, 1954)
Mrs. Kingsley (1 episode, 1955)
Nicko (1 episode, 1955)
Professor Henry Woodman (1 episode, 1955)
Gaston (1 episode, 1955)
Groba (1 episode, 1955)
Raughlin (1 episode, 1955)
Salesman (1 episode, 1955)
Pepito (1 episode, 1955)
Mr. Gibson (1 episode, 1956)
Brady (1 episode, 1954)
Mrs. Venters (1 episode, 1954)
Kali (1 episode, 1954)
Nadj (1 episode, 1954)
Mary Kingsley (1 episode, 1955)
Lars Ekberg (1 episode, 1955)
Fleck (1 episode, 1955)
Indian Charlie (1 episode, 1955)
Angard (1 episode, 1955)
Bandito (1 episode, 1955)
Jose (1 episode, 1955)
Kindu (1 episode, 1955)
Mrs. Harper (1 episode, 1955)
Bill Worth (1 episode, 1955)
Tamba (1 episode, 1955)
Fake Gibson (1 episode, 1956)
The Warden (1 episode, 1954)
Haseem (1 episode, 1954)
Fred (1 episode, 1954)
Fenton (1 episode, 1954)
Luana (1 episode, 1954)
Hendricks (1 episode, 1955)
Commandante (1 episode, 1955)
Dr. Harper (1 episode, 1955)
Grock (1 episode, 1955)
Sheriff (1 episode, 1954)
Davis (1 episode, 1954)
Neighbor (1 episode, 1955)
Alvarez (1 episode, 1955)
Arturo (1 episode, 1956)
Eddie Carter (1 episode, 1954)
Marcia Stanhope (uncredited) (1 episode, 1954)
Lieutenant Olson (1 episode, 1954)
Duroc (1 episode, 1954)
Doc (1 episode, 1954)
The General (1 episode, 1954)
Zabor (1 episode, 1954)
Bradshaw (1 episode, 1954)
Paul Ellwood (1 episode, 1954)
Gourney (1 episode, 1954)
(1 episode, 1954)
Tommy Venters (1 episode, 1954)
Woh (1 episode, 1954)
Chuck (1 episode, 1954)
Sergeant (1 episode, 1954)
Varga (1 episode, 1954)
Bluchner (1 episode, 1955)
(1 episode, 1955)
Portman (1 episode, 1955)
Professor Harlowe (1 episode, 1955)
Billy Griffiths (1 episode, 1955)
Judge Jonathan Bell (1 episode, 1955)
Bud Mayfield (1 episode, 1955)
Dr. Bowers (1 episode, 1955)
Grantz (1 episode, 1955)
(1 episode, 1956)
Detective Swan (1 episode, 1956)
Tom Blake (1 episode, 1956)
Announcer (uncredited) (3 episodes, 1954-1955)
Enemy Agent / Thug (uncredited) (2 episodes, 1955)
Guard at gate (uncredited) (1 episode, 1954)
Deputy (uncredited) (1 episode, 1954)
Doctor (uncredited) (1 episode, 1955)
Radio Operator (uncredited) (1 episode, 1955)
Thug (uncredited) (1 episode, 1955)