Movie
Columbia's 33rd serial (made between "Jack Armstrong" and "The Sea Hound") was based on the character that first appeared in "Action Comics" No. 42.
Greg Sanders / The Vigilante
Betty Winslow
George Pierce
Stuff
Prince Hamil
Police Capt. Reilly
Silver / X-2
Doc / X-3
Thorne, a.k.a. X-9 [Chs.9-11,14-15] (as Bill Brauer)