The Amazing Spider-Man #9

Published in February 1964, The Amazing Spider-Man #9 marks the first appearance of the villain Electro, a character created by Stan Lee and Steve Ditko. This issue arrived during the early, foundational years of the Marvel Age, a period defined by the creators' efforts to ground superhuman powers in relatable, often troubled, human identities. Electro, born Max Dillon, was designed as a blue-collar worker transformed by an industrial accident, reflecting the era's fascination with science-fiction hazards.

Steve Ditko provided the iconic visual design for Electro, favoring a distinctive, bold green-and-yellow lightning-bolt costume that contrasted sharply with the more muted tones of Spider-Man’s own attire. Critics and historians frequently cite this era as the peak of the Lee-Ditko collaboration, noting how their specific blend of dramatic tension and character-driven stakes solidified the series as a cornerstone of the burgeoning Marvel universe.