In 1937 the life in out West has not changed much. The boys are working at the Wyoming ranch of Captain Marvin herding horses which he sells to Kurt Redman. Marvin will not sell any horses to any army, but the boys find out that Redman is a German agent shipping the horses directly to the Third Reich. When Marvin tries to stop Redman, his son Tad, who is studying medicine in Germany, is arrested and held hostage. Marvin must fire the boys as the sneaky German agents take over the ranch, but the boys will not give up their attempt to stop them.
Bob Steele
Tucson Smith
Tom Tyler
Stony Brooke
Rufe Davis
Lullaby Joslin
Rudolph Anders
Colonel Eric Hartwig (as Robert O. Davis)
Lois Collier
Judy Barrett
Charles Miller
Cap Marvin
Alex Callam
Kurt Redman
Monte Montague
Muller
Henry Rowland
Lindrick
Richard Crane
Tad Marvin
Jack Kirk
Joe
Vince Barnett
