Spider-Man S04E10 - Chapter X - The Lizard King

Peter proposes and Mary Jane accepts, much to Anna Watson's discomfort. Peter and Mary Jane ask Curt Connors to give Mary Jane away at the wedding, when they are interrupted by three giant lizards who claim the Doc is their father and kidnap him and Mary Jane. They're taken down to sewer, with Spider-Man in pursuit, and Doc becomes the Lizard again.