Nicholas 'Nick' Carter, aka Robert Chalmers

Lou Farnsby

John A. Keller

Doctor Frankton (as Stanley C. Ridges)

Bartholomew, the bee man

Streeter - President of Radex

Hammil - tall spy boss

Krebs - 2d hurt worker

Otto - 3d hurt worker

Pete Foley - 1st pilot

Bartholomew's Bee Asst.

Cliff Parsons - Keller's Pilot & Asst.

Harbor Patrol Sgt. Denny

Factory Workman

Yacht Captain

Peake the Gardener

Engel - X-49 Workman

Ed - 1st Hurt Worker

Joe - Blueprint Security Officer

Welder

Faber - Henchman

Seaman on Yacht

Entrance Guard

Deputy

Student

Exit Guard

Sam Vaughn

Minor Role

Police Detective Randall

Draughtsman

Hartley

Streeter's Secretary

Taxi Driver

Factory Workman

Riley - Airplane Workman

Police Captain

Keller's Driver

Police Driver

Cain - Henchman

Robinson

Locker Room Attendant

Factory Workman