When Jessica Drew was bitten by a poisonous spider as a child, her father saved her life by injecting her with an experimental "spider serum," which also granted her superhuman powers. As an adult, Jessica works as editor of Justice Magazine but when trouble arises, Jessica slips away to change into her secret identity of Spider-Woman.
Diego de la Vega, the son of a wealthy landowner, returns from his studies in Spain and discovers that Los Angeles is under the command of Capitan Monastario, a cruel man who relishes in the misuse of his power for personal gain. Knowing that he cannot hope to single-handedly defeat Monastario and his troops, Diego resorts to subterfuge. He adopts the secret identity of Zorro, a sinister figure dressed in black, and rides to fight Monastario's injustice.