Mysterious deaths have been occurring in the same towns as Miller's Circus and the Governor has sent Ken Kenton to investigate. Ken joins the show but when he realizes that Bargoff is involved, Bargoff has fled and taken Mary Hiller as a hostage. The trail leads to Baron Petroff who concocted the deadly chemical and Ken quickly finds himself the Baron's prisoner.
Ken Maynard
Lucile Browne
John St. Polis
Bob Kortman
Michael Visaroff
James A. Marcus
Jack Rockwell
Frank Rice
Bobby Nelson
Jack Mower
Chief John Big Tree
Buck Bucko
Bob Burns
Edward Burns
Horace B. Carpenter
Steve Clemente
Iron Eyes Cody
Edward Coxen
Helen Gibson
Jack Hanlon
Buddy Hunter
John Ince
Jack Kirk
Fred MacKaye
Bud McClure
Merrill McCormick
Lafe McKee
Arthur Millett
Artie Ortego
Bill Patton
Edward Peil Sr.
Pascale Perry
Bob Reeves
Walter Shumway
William Steele
Hal Taliaferro
Bob Walker
Blue Washington
Slim Whitaker