Ralph Byrd
Greg Sanders / The Vigilante
Acting
Ramsay Ames
Betty Winslow
Acting
Lyle Talbot
George Pierce
Acting
George Offerman, Jr.
Stuff
Acting
Robert Barron
Prince Hamil
Acting
Hugh Prosser
Police Capt. Reilly
Acting
Jack Ingram
Silver / X-2
Acting
Eddie Parker
Doc / X-3
Acting
Tiny Brauer
Thorne, a.k.a. X-9 [Chs.9-11,14-15] (as Bill Brauer)
Acting