Scott Kolk
— Agent Dexter (X-9)
Jean Rogers
— Shara Graustark
Monte Blue
— Baron Michael Karsten
Henry Brandon
— Blackstone
Lon Chaney Jr.
— Maroni
David Oliver
— Pidge
Larry J. Blake
— Chief FBI Agent Wheeler (as Larry Blake)
Henry Hunter
— FBI Agent Tommy Dawson (C-5)
George Shelley
— Henchman Packard
Si Jenks
— 'Jolly Roger' Ticket Barker [Chs. 1, 4, 7-9]
Lynn Gilbert
— Rosel [Chs. 2, 6-7, 12]