What’s with the dark suit?
This isn’t just any ordinary suit; it's in fact an alien life form called a symbiote. These are organisms that bond with living animals then feed off the host’s adrenaline in order to survive.
Where did it come from?
In the comics, Spider-Man picked it up in Issue #8 of Secret Wars, after his original suit was destroyed. Produced by a strange machine, it oozed over his entire body giving him his edgy new look. In the film, it comes into contact with Spidey after it’s brought back to earth by astronaut John Jameson, son of J. J. Jameson (he almost got married to Mary-Jane in the movie Spider-Man 2).