"Enter the Green Goblin" is just an all-around great episode. For one, Norman's motivation for working on his super-soldier gas isn't to save his company. It's to save his son Harry, whom Kingpin threatened to kill unless Norman gets him a canister of green Captain America farts. In the Raimi movie, Norman Osborn was driven by his desire to stay a billionaire. In the "silly" kids' cartoon, he does it out of love for his child (in the only way he knew how after neglecting him for years).
The episode also has a great J. Jonah Jameson moment where he reports on Norman's company's weapons tests and badly damages its reputation despite being a shareholder in Oscorp because, in his own words, he is a journalist first. What is it with the Green Goblin bringing out the best qualities in the guy with the Hitler 'stache…?