Two Dutch treasure hunters search for a legendary Spanish galleon that sank in the Colorado River. Bat attempts to rescue the unwary pair from a desert sandstorm and two crooks who are out to steal the jewels if the ship is found.

Bat agrees to substitute for a bully as the leader of a party of buffalo hunters into Indian territory, but the man he supplanted stirs up trouble by killing a Sioux Indian brave and framing Bat for the murder.