Don Alejandro's female pen pal comes to Los Angeles and wedding bells are in the air, much to Diego's chagrin.

The alcalde has the Indian camp ransacked, leaving Zorro's mark, so as to turn the whole pueblo against the 'bandit', finds copper ore on Indian land and has a fake Zorro, a master-swordsman, rob the church's poor box, which convinces most of the villagers. The real one rides to investigate, finds the alcalde's geology report and overhears him plan a fake duel with the impostor. The alcalde confiscates the Indian land but both 'duelists' are defeated by the real Zorro.