This article contains plot points and storylines from The Amazing Spider-Man, The Amazing Spider-Man 2 and Spider-Man comics. This article does contain spoilers from those listed above.
The Amazing Spider-Man 3:
Harry Osborn orders new villain Chameleon/Mysterio to create life model decoy or hallucinations of Gwen Stacy as another obstacle for Spider-Man, to complicate and mess with Peter's mind because of Gwen Stacy's death in The Amazing Spider-Man 2. Harry Osborn destroying Peters life and people close to him, will lead Peter to go after Harry and will meet the Green Goblin; Spidey tried to beat the Goblin to death after the death of Gwen Stacy to get revenge then to realise that Goblin is much stronger than Harry. The Green Goblin reveals that he pulled the strings between Chameleon/Mysterio and Harry Osborn. He reveals how he cheated death and that. he was the Gentleman and claims that he is Norman Osborn. When Norman reveals himself to Peter that Norman Osborn is still alive and will cause a really big shock and talk over New York City. Norman Osborn also reveals that he was behind all of the things like Peter's surveillance and death of Peters parents. Then Norman Osborn gets pierced by his own Glider attempting to kill Spider-Man. It's revealed that Harry takes an overdose after hearing his dad's words. After Peter's powers prove to be too strong he takes of the -Symbitote and it's passed onto Eddie Brock.
The Amazing Spider-Man, Venom:
Following the events of the previous film the Symbitote has been passed onto Eddie Brock. Eddie uses it get revenge on Spider-Man. Spider-Man and Venom fight each other. Spider-Man and Venom realise they are both equally matched they won't gain anything from fighting each other. So they team-up to face the newly created villain: Carnage.
The Amazing Spider-Man 4:
Otto Octavius is a research scientist working head at Oscorp after the death of Norman Osborn and Harry Osborn. Left in Norman's will he plays a part in creating Oscorp's Future Sinister Six. Adrian Toomes he is an elderly scientist who claims that Oscorp has been corrupted by Norman Osborn; using Alistair Smythe's created flying technology he seeks revenge against Oscorp. He takes his 'Vulture' name from Osborn's insult and soon jailed after an encounter with Spider-Man. After Adrian Toomes didn't succeed. Otto uses the last Spider-Slayer: the four-armed harness, they becomes fused to his spinal cord, he goes after Spider-Man to take down the web-slinger himself.
The Amazing Spider-Man, Sinister Six:
In response after Doc Ock's failure of beating Spider-Man: Doc Ock plans to hire five other super-villains Spider-Man has faced. He breaks into Ravencroft Institute home the criminally insane and offers super-villains Spider-Man has faced the opportunity to escape, under the deal that they would join Oscorp's Sinister Six as redemption against Spider-Man. Only three of the criminals accepted the offer: Aleksei Sytsevich, Adrian Toomes, Dmitri Smerdyakov/Quentin Beck. Doc Ock discovers Max Dillon (once the fan, now the enemy) so he begins to search for Max at the Oscorp Power Plant were he last was seen, "Max come out to play, joint our team for redemption against Spider-Man" after a while the wires and circuits starts to move and Max Dillon reforms himself as Electro "I'm going to catch that Spider, he made me live in the wires and circuits of this city for years. Now he is going to pay the price." Doc Ock then manipulates Dr. Curtis Connors to become the Lizard once more time. Doc Ock suggests the team should fight Spider-Man one at a time; then Spider-Man will be weaker each time. The plan fails and the Sinister Six become divided they fight against each other, making Lizard depart from the team and turn against the Sinister Six and teams up with Spider-Man as Sinister Six caused mayhem and destruction over New York City.
Let me know what you think and disscus below what you would like to see in the future films.