Matt Costello

Dr. Carl Steubens (1 episode)

Joseph Barber (1 episode)

Phillip's Father

Dr. Segal

Harry Sandler

2nd Mechanic

Vince Ianelli

Zacharias

The Old Man (3 episodes)

Julio Scallini

David Samuels

Julius 'Buddy' Richards (1 episode)

Florenz Ziegfeld

Joe Delphia (1 episode)

(1 episode)

J.B. Parker (uncredited)

Avery

Gen. Clark

Helverston

(1 episode)

(2 episodes)

Reese (1 episode)

Clifford Paris (1 episode)

Charles

(1 episode)

(2 episodes)

(1 episode)

Barton

Dr. Rubias (1 episode)

Willard Lennox (1 episode)

(1 episode)

Sanders (1 episode)

Jonas Stone (1 episode)

Willoughby

(1 episode)

Dr. Halder (3 episodes)

Dr. Simon Joshua

Jensen

(54 episodes)

Questor

Louis D. Brandeis (1 episode)

J. J. Pennington (1 episode)

Cameron Burgess (1 episode)

Dr. Giuseppe Muretelli (3 episodes)

(1 episode)

Director (1 episode)

(1 episode)

Director (1 episode)

Director (1 episode)

Goodman

Director (1 episode)

Director (1 episode)

Alexander Marish (1 episode)

Director (1 episode)

(1 episode)

Director (7 episodes)

Producer (32 episodes)

Director (3 episodes)

Director (1 episode)

Vincent Noonan (1 episode)

Director (1 episode)

Director (1 episode)

Narrator / Host (39 episodes)

Host / Narrator (1 episode)

Pendergrest

Director (1 episode)

Charlie LeGrand

(1 episode)

Dave Hennessey (1 episode)

Paul Crichton (1 episode)

Phil Bentley

Kellerman

Ben Davis

Martin Hoeffer

Joe Lye

Director (3 episodes)

Arnold 'Arnie' Valent

Dr. Otto Wolff

Carl Evello

Bert Townsend

Capt. Jack Hodges

(2 episodes)

Tad McGeehan

Detective Karni

Syd Murphy

Attorney Stone

Lou Donelli

'Dutch' Kruger

Harry Thompson

(1 episode)

Whitey Lake

Mr. Craig

Earl Boettiger

Sam Cragg (1 episode)

Major "Doc" Kaiser (flight surgeon)

Paul Lawton

Dave Argus

Zack Richards

Joe Kellerson

Tommy Haley

Narrator (voice)

Branch Owens

Zepp

Julio

Raymond

Cocktail Customer (uncredited)