“CASSIDY PLAYS AN UNDERCOVER GAME!”
Disguising himself as a milquetoast Easterner who writes Western novels, Hoppy enrolls in a dude ranch in order to unmask the murderer of the owner's husband.
William Boyd
Hopalong Cassidy
George 'Gabby' Hayes
Windy Halliday
Russell Hayden
Lucky Jenkins
Charlotte Wynters
Ann Marsh
Jan Clayton
Dorrie Marsh
Robert Fiske
Monte Keller
Kenneth Harlan
John Marsh
Anthony Nace
Steve Dorman
Kathryn Sheldon
Abigail Snodgrass
Maurice Cass
E. Prescott Furbush
Alphonse Ethier
Superintendent
Glenn Strange
Bouncer
Claudia Smith
Mary Rogers
Jack Rockwell
Stage Driver Bill (uncredited)
Buck Bucko
Barfly
Old Shatterhand
Maverick
They Call Me Trinity
Bad Men's Money
The Horse Whisperer
Dude, Where's My Car?
Big Jake
China 9, Liberty 37
Texas Terror
Alias John Law
Old Yeller
Abilene Town
Code of the Lawless
Cowboy Blues
The Far Country
Tickle Me
Under California Stars
Green Grass of Wyoming
My Friend Flicka
Rio Grande
Broken Lance
The Tall Men
Man Without a Star
Pardners
Ramrod
Wild Rovers
Monte Walsh
Go West
Forty Guns
Day of Reckoning
Tall in the Saddle
Appaloosa
Man in the Shadow
Scooby-Doo! Shaggy's Showdown
The Cowboys
Montana Story
Boss Nigger
The Violent Men
McLintock!
City Slickers
