History
Eddie Brock was present when a Spider-Man impostor appeared, attacked a science expo, and stole a piece of Otto Octavius' technology. Despite seeing Peter Parker in the crowd, Eddie transformed into Venom and vowed to take down Spider-Man, whom he believed to have become a villain. He kidnapped Mary Jane in an attempt to lure Spider-Man to him. When Spider-Man found him, he gave chase, and Venom lured him into an alley, where they battled briefly. After a fight through the sewers, Spider-Man reminded Venom that he had seen him out-of-costume when the impostor attacked, and that it couldn't have been him. Venom apologized(Which only aggravated Spider-Man more), and joined forces with Spider-Man to stop the impostor.
Venom suggested that Chameleon may be the impostor, and quickly began spouting names off the top of his head as guesses to who wanted Octavius' technology (among those being The Sub-Mariner, The Mighty Thor, and Galactus). When the two went to the Daily Bugle to use the computers there, Venom sensed Carnage and ran off to find him.
Otto Octavius was eventually revealed to be working with Carnage. Venom fought Carnage while Spider-Man fought Doc Ock, but lost, and left Spider-Man to fight Carnage himself.
When Doc Ock's lab exploded, the two were rescued by Captain America. Venom mentioned that he wanted his autograph.