9. Planet Of The Apes 2
The Movie: After Tim Burton's controversial 2001 Planet of the Apes remake scored over $350 million worldwide, it was clear that a franchise was in the making, and before the movie even came out, Fox had committed to a sequel pending its box office showing.
Why It Got Cancelled: Despite grossing more than 3.5x its budget, Fox ultimately opted against a sequel, with Burton declining to return and in turn discouraging stars Mark Wahlberg and Helena Bonham Carter.
Fans have speculated ever since that the overwhelmingly negative audience reception to the film's head-scratching twist ending sequel hook may be partly to blame for the follow-up never coming together.
Thanks to this, though, we got the wonderful reboot trilogy of Andy Serkis-starring movies, so everything worked out just fine in the end.