Knight Rider: Starting with Ultimate Spider-Man

My name is Lin Zhenya, I am Kamen Rider No. 3, And I am also a time traveler. I found out this after I recovered my memory. After recovering my memory, I found that I accidentally came to the world of the anime Ultimate Spider-Man, but this world seemed different from the anime I was familiar with. Why is Dr. Otto the movie version? What does it mean that Harry drank the Green Goblin serum to save his father and turned into a green elf? What does it mean that Mary Jane was possessed by venom and then punched Spider-Man down? What the hell are Baijie and Xiuka?