Long before Superman or Batman made their first appearances, there was Zorro. Born on the pages of the pulps in 1919, Zorro fenced his way through the American popular imagination, carving his signature letter Z into the flesh of evildoers in Old Spanish California. Zorro is the original caped crusader, the first hero to have a band called the Avengers, and the character who laid the blueprint for the modern American superhero: the mask, the alter-ego, extraordinary physical skills, and a struggle against arch-villains. Famed comics pioneer Bob Kane even wrote that &“Zorro was a major influence on my creation of Batman.&” In Zorro's Shadow, historian and Latin American studies expert Stephen J. C. Andes investigates the legends behind the mask of Zorro, revealing that the origin of America's first superhero lies in Latinx history and experience. Andes begins his investigation in Mexico City at a statue of William Lamport, the so-called &“Irish Zorro,&” who was burned at the stake by the Mexican Inquisition. There, he discovers new documents at the Mexican National Archives and travels to the Sonoran desert to find the birthplace of Joaqu&ín Murrieta, a California Gold Rush bandit who many claim inspired the creation of Zorro. Based on the never-before-seen letters of Zorro creator Johnston McCulley, Andes describes how the legends around Lamport and Murrieta influenced the development of the masked hero in black, and further, how Zorro went from a real life Mexican bandido to a distinctly white, aristocratic hero. Revealing the length of Zorro's shadow on the superhero genre is a reclamation of the legend of Zorro for a multiethnic and multicultural America.