In Spider-Man 3 , Peter Parker has balanced his personal and secret dual lives and when he is bonded with a mysterious symbiote enhancing his superpowers and his inner dark personality , leading him on a search for his uncle 's killer Flint Marko , meanwhile he himself is being pursued by the super-human assassin Harry Osborn .
Following the events of Spider-Man 2 , as Peter Parker prepares his future with Mary Jane Watson , he bonds with an extraterrestrial symbiote , bringing out his anger , while facing Harry Osborn , seeking to avenge his father ’ s death , and an escaped thug who killed Peter 's uncle and becomes Sandman after a freak accident .
Spider-Man 3