Nick Carter, Master Detective

Walter Pidgeon

Nicholas 'Nick' Carter, aka Robert Chalmers

Rita Johnson

Lou Farnsby

Henry Hull

John A. Keller

Stanley Ridges

Doctor Frankton (as Stanley C. Ridges)

Donald Meek

Bartholomew, the bee man

Addison Richards

Streeter - President of Radex

Henry Victor

Hammil - tall spy boss

Milburn Stone

Krebs - 2d hurt worker

Martin Kosleck

Otto - 3d hurt worker

Frank Faylen

Pete Foley - 1st pilot

Sterling Holloway

Bartholomew's Bee Asst.

Wally Maher

Cliff Parsons - Keller's Pilot & Asst.

Edgar Dearing

Harbor Patrol Sgt. Denny

Ernie Alexander

Factory Workman

Louis V. Arco

Yacht Captain

Frank Ball

Peake the Gardener

Don Brodie

Engel - X-49 Workman

Don Castle

Ed - 1st Hurt Worker

Eddy Chandler

Joe - Blueprint Security Officer

Gene Coogan

Welder

Paul Ellis

Faber - Henchman

Bud Geary

Seaman on Yacht

Chuck Hamilton

Entrance Guard

Edward Hearn

Deputy