"Hoppy goes undercover as an outlaw (which permits him, for once, to drink and be mean to children) to track down a bunch of outlaws operating along the border. Loco, the head bad guy, deflects suspicion from himself by pretending to be a moron."
William Boyd
as Hopalong Cassidy
James Ellison
as Johnny Nelson
George 'Gabby' Hayes
as Windy Halliday
Morris Ankrum
as Loco
John Beach
as Bailey
Nora Lane
as Grace Rand
Charlene Wyatt
as Molly Rand
Trevor Bardette
as Colonel Gonzales
Earle Hodgins
as Major Stafford
Al Bridge
as Dandy Morgan
George Chesebro
as Tom Parker
John St. Polis
as Doctor
Silver Tip Baker
as Barfly
Hank Bell
Harry Bernard
as El Rio Bartender
Buck Bucko
as Texas Ranger
Roy Bucko
Ed Cassidy
as Henchman
Jim Corey
Joe Dominguez
as Mexican
Frank Ellis
as Frank
Jack Evans
as El Rio Townsman
Herman Hack
Karl Hackett
as American Visitor
J.P. McGowan
as El Rio Sheriff
Leo J. McMahon
Cliff Parkinson
Frosty Royce
as Cowhand
Francis Walker
Slim Whitaker
as Reads Newspaper
Bob Walker
Nate Watt
Director
Harry Sherman
Producer
Eugene Strong
Associate Producer
Lee Zahler
Original Music Composer
Archie Stout
Director of Photography
Robert B. Warwick Jr.
Editor
Lewis J. Rachmil
Art Direction
Derwin Abrahams
Assistant Director
Harry Knight
Earl Sitar
Sound
Harrison Jacobs
Screenplay
Dialogue
Clarence E. Mulford
Story