The Amazing Spider-Man Vol. 1 (1963-1998) #39

Plot

Peter heads to the doctor with the sniffles and learns that Aunt May's health is very fragile; Spidey is roped into tangling with a bunch of goons who zap him with a mysterious gas; Not realizing that the gas has weakened his spider sense, he changes into Peter Parker under the watchful gaze of the Green Goblin; The Goblin confronts Spidey outside of his home and captures him as Peter is worried that Aunt May might be overcome by the commotion; Trussed up in the Goblin's lair, Peter is shocked when the Goblin takes off his mask and reveals himself to be Norman Osborn.