Nicholas 'Nick' Carter, aka Robert Chalmers

Walter Pidgeon

Lou Farnsby

Rita Johnson

John A. Keller

Henry Hull

Doctor Frankton (as Stanley C. Ridges)

Stanley Ridges

Bartholomew

Donald Meek

Streeter - President of Radex

Addison Richards

Hammil - tall spy boss

Henry Victor

Krebs - 2d hurt worker

Milburn Stone

Otto - 3d hurt worker

Martin Kosleck

Pete Foley - 1st pilot

Frank Faylen

Bartholomew's Bee Asst.

Sterling Holloway

Cliff Parsons - Keller's Pilot & Asst.

Wally Maher

Skeptical Harbor Patrol Sgt. Denny

Edgar Dearing

Airplane Builder

Richard Lane

Factory Workman

Ernie Alexander

Riley - Airplane Workman

Lee Phelps

Yacht Captain

Louis V. Arco

Peake the Gardener

Frank Ball

Hartley

George Meeker

Engel - X-49 Workman

Don Brodie

Ed - 1st Hurt Worker

Don Castle

Cain

Jack Perrin

Joe - Blueprint Security Officer

Eddy Chandler

Faber - Henchman

Paul Ellis

Welder

Gene Coogan

Captain of Cruiser

Louis Arco

Seaman on Yacht

Bud Geary

Factory Workman

Charles Flynn

Entrance Guard

Chuck Hamilton

Deputy

Edward Hearn

Student

Kenner G. Kemp

Exit Guard

William Lally

Minor Role

Carey Loftin

Police Detective Randall

Wilfred Lucas

Draughtsman

Joseph P. Mack

Streeter's Secretary

Roger Moore

Taxi Driver

William Newell

Factory Workman

Gil Perkins

Police Captain

Lee Prather

Keller's Driver

Charles Sherlock

Police Driver

Harry Templeton

Cain - Henchman

Richard Terry

Robinson

Andrew Tombes

Locker Room Attendant

Harry Tyler