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