Special Agent Tom Colby / SAC Kendall Lisbon
Lewis Erskine
Arthur Ward
Narrator (uncredited)
Agente especial Chris Daniels
Agente especial Jim Rhodes
Barbara Erskine
SAC Chet Randolph / Agent Wright
SAC Bryan Durant / Alvin Forest
Hair and Fibers Expert / RA Dan Menaphee
Orkin / Kelsey Waller
Glenn Orland / Bernard Stoddard
Clenard Massey / Duke Bergan
Stan Jason / Ed Ramser
John Parker / William Braden
R. A. Dale Cameron / SAC Allen Bennett
Victor Quinlan / Nicholas Allen
Vincent Millard / Dave Rice
Bryan Carlson / Frank Rim
SAC Gary Morgan / SAC William Converse
Howard Rademaker / Frank Welles
Scientist / Arly Carter
Higgins / Christian Palmer
Allen Clarke / Barnes
