Milburn Stone

Character: Agent Tom Brant

Jan Wiley

Character: Janet Lowe

Dennis Moore

Character: Jack Ryan

Addison Richards

Character: Gerhard Doenitz / Garret Donahue

Byron Foulger

Character: Prof. Elwood Henderson

Maris Wrixon

Character: Dorothy Newton

Sarah Padden

Character: Aggie

George Lynn

Character: Herman

Russell Hicks

Character: Police Chief Michael J. O'Brien

Roland Varno

Character: Arnold Hoffman

Lash LaRue

Character: Migsy

Jerry Shane

Character: Dan

Neyle Morrow

Character: Spike

John Eldredge

Character: Walter Stark