Douglas Fairbanks impersonates a wealthy young Spanish noble who, in his proper person, is an indolent imbecile, the despair of his father and of his charming sweetheart. When he sallies forth a masked black figure on a black horse, the terrible Zorro, he rescues the oppressed and leaves “The Mark of Zorro,” a “Z” made with his rapier, on the oppressor of the weak.