Spider-Man 3 (the original version)

Plot
The pitch for the original Spider-Man 3 is Spider-Man (Tobey Maguire) would throw Vulture in jail, leaving the latter to stew in his hatred and cook up a plot for revenge; Sandman would become his cellmate and they’d team up to bust out and wreak havoc; in the end, Spidey would offer a truce to Vulture, who would refuse and die during their big fight, thus "illustrating to Peter the ramifications of a heart hardened by an inability to forgive". It would also only set up Venom not make him main villain.

Cast

 * Tobey Maguire as Spider-Man/Peter Parker
 * Kirsten Dunst as Mary Jane Watson
 * Ben Kingsley as Adrian Tomes/The Vulture
 * J.K. Simmons as J. Jonah Jameson
 * James Franco as Harry Osborn

Why It Was Cancelled

 * 1) On March 15 2005, the Vulture was removed from the script and was replaced with Sandman and Venom.
 * 2) Sony rushed Sam Raimi with the deadline of Spider-Man 3.

Results

 * The original version of Spider-Man 3 was permanently cancelled.
 * In 2007 a different version of Spider-Man 3 came out which got mixed reviews from critics and audiences.
 * Because of this, all future projects involving Sam Raimi and the Tobey Maguire Spider Man universe had been cancelled, including Spider-Man 4. https://cancelled-movies.fandom.com/wiki/Spider-Man_3_(the_original_version)