Walter Pidgeon
Role: Nicholas 'Nick' Carter, aka Robert Chalmers
Rita Johnson
Role: Lou Farnsby
Henry Hull
Role: John A. Keller
Stanley Ridges
Role: Doctor Frankton (as Stanley C. Ridges)
Donald Meek
Role: Bartholomew, the bee man
Addison Richards
Role: Streeter - President of Radex
Henry Victor
Role: Hammil - tall spy boss
Milburn Stone
Role: Krebs - 2d hurt worker
Martin Kosleck
Role: Otto - 3d hurt worker
Frank Faylen
Role: Pete Foley - 1st pilot
Sterling Holloway
Role: Bartholomew's Bee Asst.
Wally Maher
Role: Cliff Parsons - Keller's Pilot & Asst.
Edgar Dearing
Role: Harbor Patrol Sgt. Denny
Ernie Alexander
Role: Factory Workman
Louis V. Arco
Role: Yacht Captain
Frank Ball
Role: Peake the Gardener
Don Brodie
Role: Engel - X-49 Workman
Don Castle
Role: Ed - 1st Hurt Worker
Eddy Chandler
Role: Joe - Blueprint Security Officer
Paul Ellis
Role: Faber - Henchman
Bud Geary
Role: Seaman on Yacht
Chuck Hamilton
Role: Entrance Guard
Kenner G. Kemp
Role: Student
William Lally
Role: Exit Guard
Richard Lane
Role: Sam Vaughn
Carey Loftin
Role: Minor Role
Wilfred Lucas
Role: Police Detective Randall
Joseph P. Mack
Role: Draughtsman
George Meeker
Role: Hartley
Roger Moore
Role: Streeter's Secretary
William Newell
Role: Taxi Driver
Gil Perkins
Role: Factory Workman
Lee Phelps
Role: Riley - Airplane Workman
Lee Prather
Role: Police Captain
Charles Sherlock
Role: Keller's Driver
Harry Templeton
Role: Police Driver
Richard Terry
Role: Cain - Henchman
Andrew Tombes
Role: Robinson
Harry Tyler
Role: Locker Room Attendant
Charles Flynn
Role: Factory Workman