When three Texas Rangers try to investigate kidnapped Mexicans being used as forced labor in the mines of Silver Bullet, they are framed for murder by the town's corrupt sheriff.

William Boyd
as Hopalong Cassidy

Andy Clyde
as California Carlson

Jay Kirby
as Johnny Travers

Russell Simpson
as Orestes Krebs

Claudia Drake
as Inez LaBarca

George Reeves
as Don Enrique Perez

Robert Mitchum
as Quinn

Duncan Renaldo
as Commandante

Pierce Lyden
as Loren

Cliff Parkinson
as Barton