<P> During a festival honoring Spider - Man, Peter kisses Gwen Stacy, infuriating Mary Jane . The super-powered Marko robs an armored car, and Peter confronts him . Marko easily subdues Peter, and escapes . NYPD Captain George Stacy informs Peter and Aunt May that Marko was Uncle Ben's true killer; the deceased Dennis Carradine was Marko's accomplice . As Peter sleeps in his Spider - Man suit, the symbiote assimilates his suit . Peter later awakens and discovers his costume changed and his powers enhanced; however, the symbiote also brings out Peter's dark side . Wearing the new suit, Peter locates Marko and battles him in a subway tunnel . Discovering that water is Marko's weakness, Peter breaks a water pipe, causing water to reduce Marko into mud and washing him away . </P> <P> Peter's changed personality alienates Mary Jane, whose career is floundering, and she finds solace with Harry, but leaves afterwards in regret . Harry recovers from his amnesia and, urged by a hallucination of his father, blackmails Mary Jane into breaking up with Peter . After Mary Jane tells Peter she loves "somebody else", Harry meets with Peter and claims to be "the other guy". Peter confronts Harry about forcing Mary Jane to end her relationship with him and spitefully tells Harry that his father never loved him . Another battle ensues, in which Harry throws a pumpkin bomb at Peter, who deflects it back, disfiguring Harry's face . </P> <P> Meanwhile, Peter exposes rival photographer Eddie Brock, whose fake photos depict Spider - Man as a criminal . This plagiarism results in their boss, J. Jonah Jameson, firing Brock . Later, to make Mary Jane jealous, Peter brings Gwen to a nightclub, where Mary Jane now works . Realizing this, Gwen leaves the nightclub, and, after he accidentally attacks Mary Jane, he realizes how the symbiote is corrupting him . Retreating to a bell tower of a church, Peter rings the bell to weaken and remove the symbiote, which falls below to the lower tower and bonds with Brock, who in turn, praying for Peter's death, is transformed into Venom . Brock locates Marko and convinces him to join forces to defeat Peter . </P> <P> Posing as a taxi driver, Brock kidnaps Mary Jane, and holds her as bait from a web high above a construction site, while Marko keeps the police at bay . Seeking help, Peter goes to Harry, who rejects him . While Peter battles Brock and Marko, Harry learns the truth about his father's death from his butler, and goes to the construction site to help Peter, resulting in a battle between the four . Harry subdues the Sandman before assisting Peter against Brock . In the ensuing battle, Brock attempts to impale Peter with Harry's glider, but Harry steps in, and is impaled himself . Remembering the symbiote's weakness, Peter assembles a perimeter of metal pipes to create a sonic attack, weakening it, and allowing Peter to separate Brock from the symbiote . Peter activates a pumpkin bomb from Harry's glider and throws it at the symbiote, but Brock, attempting to become Venom again, dives in and, along with the symbiote, is killed . </P>

Where did the venom come from in spiderman 3
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