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