Borderland

“WILLIAM BOYD, the daring "Hopalong Cassidy" plays a lone game against the law!”

Directed by Nate Watt

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.