After discovering he had inherited Retroviral Hyperplasia, the same terminal genetic illness as his father, he returned to take over Oscorp in response to Norman's demise. Harold 'Harry' Theopolis Osborn is the son of Norman Osborn, the ex-CEO of Oscorp Industries, the former best friend of Peter Parker, the first leader of the Sinister Six and the supervillain known as the Green Goblin. I'm gonna take away yours.' ―Green Goblin to Spider-Man