When attacked by two dogs, Joe Gilmore leaves them on the desert to die. Later one of the dogs saves John Blake from drowning. Men arrive claiming the dog is killing their chickens. They want to kill the dog but John convinces them the dog's fate should be determined by a trial.
Beasley, who is after Gayner's land, plans to kidnap his daughter. But Dale overhears their plan and kidnaps her himself. When Gayner arrives to retrieve his daughter, Beasley kills him and makes the Sheriff arrest Dale for the murder.
Jimmy, a young boy, idolizes famed train engineer Casey Jones and is devastated when his hero is killed in a train wreck. The boy grows up to be a railroad engineer, too, but one day the train he is piloting loses its brakes and wrecks. Jimmy tries to fix it but has to jump off at the last minute. Unfortunately, stories begin to circulate that he turned coward and jumped off the train first, letting it be destroyed rather than try to save it. He sets out to clear his name.
When legendary hunter Bob Rainsford is shipwrecked on the perilous reefs surrounding a mysterious island, he finds himself the guest of the reclusive and eccentric Count Zaroff. While he is very gracious at first, Zaroff eventually forces Rainsford and two other shipwreck survivors, brother and sister Eve and Martin Towbridge, to participate in a sadistic game of cat and mouse in which they are the prey and he is the hunter.
The Wrecker wrecks trains on the L & R Railroad. One of his victims is Larry Baker's father. Baker wants to find the evildoer, among a host of suspects, but it will be difficult since the Wrecker can disguise himself to look like almost anyone
Canadian Mountie Mason is sent south of the border to look for a horse thief with only a watch chain for evidence. He befriends young Andy and when Calhoun hits Andy, Mason and Calhoun fight. In the scuffle Calhoun's watch with the missing chain is dislodged. Mason then sets out to bring in Calhoun and his gang.
Clint Belmet (Gary Cooper) is a bit of a firebrand and is sentenced to at least 30 days in jail, but his partners, Bill Jackson (Ernest Torrence) and Jim Bridger (Tully Marshall) talk a sympathetic Frenchwoman named Felice (Lili Damita) into telling the bumbling, drunken marshal that Clint had married her the previous night. Clint is released so he can accompany Felice on the wagon train heading west to California.
Bulldog Drummond is a British WWI veteran who longs for some excitement after he returns to the humdrum existence of civilian life. He gets what he's looking for when a girl requests his help in freeing her uncle from a nursing home. She believes the home is just a front and that her uncle is really being held captive while the culprits try to extort his fortune from him.