The Amazing Spider-Man #90 marked the first appearance of the classic villain, Green Goblin. The story begins with Peter Parker, aka Spider-Man, swinging through the city when he sees a man robbing a bank. Spider-Man quickly apprehends the robber and turns him over to the police. As Spider-Man is swinging away, he is suddenly attacked by a mysterious new villain, the Green Goblin. The Green Goblin is armed with a variety of weapons, including a pumpkin bomb and a glider. Spider-Man is caught off guard and is quickly defeated by the Green Goblin. The Green Goblin then leaves Spider-Man for dead and flies away.
Peter Parker is taken to the hospital, where he is treated for his injuries. While he is in the hospital, Peter learns that the Green Goblin is actually Norman Osborn, the father of his best friend, Harry Osborn. Peter is shocked by this revelation and vows to stop the Green Goblin.
A few days later, Peter is released from the hospital and returns home. He decides to build a new Spider-Man costume that will be more resistant to the Green Goblin's weapons. He also begins to train harder so that he will be better prepared for his next encounter with the Green Goblin.
A few weeks later, the Green Goblin attacks again. This time, Spider-Man is ready for him. The two battle for hours, and in the end, Spider-Man is victorious. The Green Goblin is defeated and Spider-Man saves the day.