John Craig is a struggling young contractor who falls into a crooked business scheme. A trio of unsavory partners on the verge of dissolving their company have hired him for a job, assuming that he will fail.
Horace and Chester search for peace and quiet in the Arizona desert, with Lizzy, their personalized jalopy. Arriving in a small town they befriend two girls, a crack-pot prospector, and attract the ire of a dangerous outlaw.
Ted is riding for Pa Martin against Cooper in the big race. When Cooper has his men capture Ted, Peggy overhears them and sets out to free Ted in time for the race.
Jus' travlin', Bob and his sidekick run into the outlaw Jean Le Roque. A miner has found gold and Le Roque not only wants the gold but also the miner's daughter. He captures the miner and tries to get the mine's location from him. He also tells the daughter he will kill her father unless she marries him. After disposing of Le Roque's gang by accidentally setting off a explosive charge that kills them, Bob goes after Le Roque.