Gov. Don Diego (Alain Delon) finds his new jurisdiction subjugated to martial law at the hands of the tyrannical Col. Huerta (Stanley Baker). Diego feigns compliance, but clandestinely plots Huerta's demise. With the help of a brave monk, Diego dons a mask and becomes "Zorro," a swashbuckler dedicated to liberating his people. Diego struggles to protect his secret identity while also courting -- as Zorro -- the lovely Hortensia (Ottavia Piccolo), a wealthy woman eager to end Huerta's reign.