Dennis Moore

~ as ~

Capt. Steve Clark

Wanda McKay

~ as ~

Cathy Haines

Lionel Atwill

~ as ~

Erich von Rugen, alias Alex Morel

Joe Sawyer

~ as ~

Idaho Jones

Regis Toomey

~ as ~

Capt. Clay Randolph [Chs. 1-6]

Virginia Christine

~ as ~

Countess Elsa von Merck, alias Trina Dressard

Eddy Waller

~ as ~

Doc Blair (as Eddy C. Waller)

Emmett Vogan

~ as ~

Count Manfried von Rinkton, alias Carl Lawton [Chs. 6-7]

Addison Richards

~ as ~

Colonel Sewell

Charles Wagenheim

~ as ~

Hugo Metzger, alias Abel Rackerby [Chs. 8-9]