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.
as Hopalong Cassidy
as Johnny Nelson
as Windy Halliday
as Loco
as Bailey
as Grace Rand
as Molly Rand
as Colonel Gonzales
as Major Stafford
as Dandy Morgan
as Tom Parker
as Doctor
as Barfly
as El Rio Bartender
as Texas Ranger
as Henchman
as Mexican
as Frank
as El Rio Townsman
as American Visitor
as El Rio Sheriff
as Cowhand
as Reads Newspaper
Hop-a-long Cassidy
The Eagle's Brood
Bar 20 Rides Again
Heart of the West
Call of the Prairie
Three on the Trail
Hopalong Cassidy Returns
Trail Dust
Borderland
Hills of Old Wyoming
North of the Rio Grande
Rustlers' Valley
Hopalong Rides Again
Texas Trail
Partners of the Plains
Cassidy of Bar 20
Heart of Arizona
Bar 20 Justice
Pride of the West
In Old Mexico
The Frontiersmen
Sunset Trail
Silver on the Sage
Renegade Trail
Range War
Law of the Pampas
Santa Fe Marshal
The Showdown
Hidden Gold
Stagecoach War
Three Men from Texas
Doomed Caravan
In Old Colorado
Border Vigilantes
Pirates on Horseback
Wide Open Town
Riders of the Timberline
Stick to Your Guns
Twilight on the Trail
Outlaws of the Desert
Secret of the Wastelands
Undercover Man
Lost Canyon
Hoppy Serves a Writ
Border Patrol
Leather Burners
Colt Comrades
Bar 20
False Colors
Riders of the Deadline
Texas Masquerade
Lumberjack
Mystery Man
Forty Thieves
Fool's Gold
The Devil's Playground
Unexpected Guest
Dangerous Venture
The Marauders
Hoppy's Holiday
Silent Conflict
The Dead Don't Dream
Sinister Journey
Borrowed Trouble
False Paradise
Strange Gamble