

The U.S. Army needs more horses for the Spanish-American War. Hoppy must turn his Bar 20 cowhands into Rough Riders to gather up the horses, and of course bad guys try to sabotage the operation.

William Boyd
Hopalong Cassidy

Russell Hayden
Lucky Jenkins

George 'Gabby' Hayes
Windy Halliday

Judith Allen
Barbara Allen
Billy King
Boots

Alexander Cross
Black Jack Carson

Karl Hackett
Major McCready

Bob Kortman
Hawks

Jack Rockwell
Shorty
John Beach
Smokey