Secret Agent X-9 (1937)

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]