Working undercover, Allen and sidekick Mendoza are out to stop the mail train robberies. Rivers and his gang are the culprits and by joining up with them, they hope to get the evidence they need.

Tom Keeneas Tom Allen
Frank Yaconellias Lopez Mendoza
LeRoy Masonas Jeff Gordon (as Le Roy Mason)
Fred Kohler Jr.as Lucky Webster
Glenn Strangeas Sheriff Big Bill Collins
Gene Alsaceas Henchman Rod
James Sheridanas Henchman Cheyenne
Karl Hackettas Jim Rivers