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.
Hopalong Cassidy
Johnny Nelson
Windy Halliday
Loco
Grace Rand
Molly Rand
Colonel Gonzales
Major Stafford