SPECTACULAR SPIDER-MAN (1976) #66

Peter just wants to have a study date with Marcy Kane, but will sparks fly when Electro breaks out of prison? After successfully escaping from a specialized prison, Electro’s first task at hand was – of course – defeating Spider-Man. After nearing getting himself killed, Spider-Man created a new insulated suit and matched fists with Electro in Round Two, creaming the electric-wielding villain with an easy blow to his face. This is the first appearance of Spider-Man’s rubber insulated suit.