When I got into spider-man was when they brought the series, done by the creators of x-men, to sat morning cartoons. The way the Venom storyline went on the show, and I think the most probable way it will go in the movie, is Jamesons son who is already an astronaut is returning from his mission to the moon where they picked up some samples of a mineral known as Prometheum-X for the Kingpin. The Kingpin part might not be in there but the sample most definitely will.
Anyways so as the shuttle is re-entering Earths atmosphere this sticky black goo which appears to be alive oozes from the rock and attacks both of the shuttles pilots, knocking them unconscious. Consequently the shuttle is above New York when this begins to happen and our friendly neighborhood Spider-Man sees all of these events as well as most of New York. (it’s kind of hard to miss a space shuttle flying in between buildings even in New york.) So the shuttle ends up crashing into the George Washington bridge and Spidey goes out there to help rescue the pilots. After our heros job is done he returns home only to realize that he has what he thinks are chemicals from the shuttle crash all over his costume in the form of a black sticky substance. After he is asleep the ooze makes its way to Peter’s bed and the next thing he knows he is dangling above New York unaware of where he is or how he got there, wearing a fancy new black costume.
I feel like this post is going on way too long so I’m going to end there but if there is enough response to this I can go more into detail about how Venom comes from all of this. Thanks for letting me rant!