Green Goblin

Harry Osborn is a college student from New York City who fell ill during his early twenties with an incurable disease. Despite the odds; Harry's father, Norman Osborn, began experimenting on him in an attempt to cure his illness, using the Amazing Spider-Man's DNA, Norman thought he had cured Harry and at the same time, made him superhuman, however, it was quickly uncovered that Harry's new abilities came with the cost of his mind as he began to suffer from a split personality disorder, one being Harry and the other being the sinister Green Goblin

In a different Universe in the year 2024, at an unknown point in Harry's timeline, he was summoned into that universe when Doctor Strange cast a spell to erease everyones memories of that Universe's Peter Parker, who messed up the spell. For a long time, another Universe's Doctor Octopus had Peter convinced that it was his Universes Goblin which had travelled with them but in fact it was a far far worse version.

Eventually, Harry managed to take over and he tracked down that Universe's Parker for help, he assisted him in manufacturing cures for the villains to send them back home with another chance at life, however, after curing Octavius, the Goblin took over again and fought Spider-Man, klilling his aunt May before fleeing. Eventually, once the rest of the villains had been defeated, Osborn revealed himself once again in an attempt to kill that Universe's Spider-Man, his own as well as another Universes, he was defeated by the current Spider-Man before being cured while taunting him over the fact he had murdered May. Following this, he was sent to a home timeline to continue his studies with his own Parker, despite the fact in his original timeline, he continued to be the Goblin