8 Movies That Completely Ignored Important Plot Points
6. Spider-Man 3 - The Extra Symbiote
Spider-Man 3 is all about Peter Parker struggling with his darker side, which manifests itself as a creepy dancing emo man-child whose sole purpose is to freak out the entire female population of New York City. Or something like that.
Peter's strange new behaviour is the result of him bonding with the Venom symbiote, an alien creature that lands on Earth - inside a meteor - early in the film. The symbiote then follows Peter home, links with him, and we have our movie.
By the end the symbiote is destroyed in a big explosion, after Peter traps it in a circle of metal pipes. But that's not the only bit of the creature that came from the meteor - Peter's teacher, Doctor Connors, also has a sample that doesn't get destroyed.
So what happened to that extra sample? The movie never addresses it or goes back to it in any way. Considering how dangerous the symbiote can be, this is a glaring omission from the plot, and makes the destruction of what our main characters think is the entire symbiote rather pointless.
It's believed that any dangling symbiote plot threads would have been used in Spider-Man 4 to explain the appearance of Carnage, but without such a sequel, the lack of a resolution in Spider-Man 3 stands out significantly.