Fay Wray stars in this south-of-the-border fable about a noble bandito who comes to the romantic rescue of an innocent señorita. El Capitan Thunder (Hungarian silent-screen star Victor Varconi) is a caballero whose love of life, liquor and ladies is only surpassed by his honor. Although El Capitan is adept at breaking the law and breaking hearts, his promises are sacred and never broken. While the amusingly inept Comandante Ruiz (Dutch-born comic actor Charles Judels) conspires to trap El Capitan, gringo rancher Morgan (Robert Elliot) schemes to win the hand of Ynez (Wray) over her suitor of choice, local boy Juan (Don Alvarado). Also smitten with Ynez, El Capitan gives her his sacred vow after she helps him escape Ruiz's soldiers, but El Capitan's bond is on a collision course with a previous promise made to a fellow gringo... Morgan! Can El Capitan steal a wedding and save the day?