Spider-Man 3 features a fictional character.
Gwendolyn Maxine `` Gwen '' Stacy is a fictional character who appears in American comic books published by Marvel Comics , usually as a supporting character in those featuring Spider-Man . Sandman ( William Baker a.k.a. Flint Marko ) is a fictional supervillain appearing in American comic books published by Marvel Comics . Spider-Man 3 . During pre-production , Raimi originally wanted another villain to be included along with Sandman , but at the request of producer Avi Arad he added Venom , and the producers also requested the addition of Gwen Stacy . Venom , or the Venom Symbiote , is a fictional character appearing in American comic books published by Marvel Comics , commonly in association with Spider-Man .