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]