Roy Rogers, Smiley Burnette and the Sons of the Pioneers go undercover to help Texas Governor Russell Hicks stop World War II Axis sympathizers from blowing up U.S. warehouses.

Roy Rogers
as Roy Rogers

Peggy Moran
as Judy Mason

Smiley Burnette
as Frog Millhouse

Dorothea Kent
as Ruby Smith

Gerald Mohr
as Maurice

James Bush
as Dave Mason

Lloyd Corrigan
as Kraley

Russell Hicks
as Texas Governor

Bob Nolan
as Bob

Pat Brady
as Pat - Member Sons of the Pioneers