An evil gang is involved in both cattle rustling and the robbing of stagecoaches. Hoppy must stop them without help from the sheriff who turns out be a major outlaw himself.

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.

Racehorse-owner Dan Morgan is ruled off the track and out of racing when his horse is doped by a rival owner who knows that Dan's horse can win a high-stakes race. Trying to clear his name, Dan runs into many difficulties and incidents, including a blazing barn filled with valuable horses, before he is able to gather the needed evidence against the guilty man.