Cast
- Clayton Moore as Agent Ted O'Hara
- Roy Barcroft as Vic Murkland
- Roy Barcroft as Commissioner Angus Cameron
- Ramsay Ames as Frances Blake
- Gil Frye as Duke Graham
- Tom Steele as John Parker (Lanky Thug) [Chs. 2, 6]
- Tom Steele as Gifford [Ch. 7]
- Tom Steele as Jack [Ch. 11]
- Dale Van Sickel as Fred Brent (Thug) [Ch. 1-2]
- Dale Van Sickel as Slocum (Thug) [Ch. 7]
- Dale Van Sickel as Bud [Ch. 8]
- Edmund Cobb as R.J. Cook
- Stanley Price as Robert 'Doc' Benson
- Jack O'Shea as Slater - Benson's Aide
- Barry Brooks as George (Orderly) [Ch. 8]
Crew
- Fred C. Brannon · Director
- Yakima Canutt · Director
- Franklin Adreon · Writer
- Basil Dickey · Writer
- Sol Shor · Writer
- Jesse Duffy · Writer
- John MacBurnie · Cinematographer
- Cliff Bell Sr. · Editor
- Sam Starr · Editor