Teenage Mutant Ninja Turtles IV: The Foot Walks Again

Teenage Mutant Ninja Turtles IV: The Foot Walks Again was a planned sequel to the live-action Teenage Mutant Ninja Turtles films.

Plot
The story would have a fifth turtle join the team named Jack Kirby.

Why It Was Cancelled
1. The film was cancelled due to the negative reception of Teenage Mutant Ninja Turtles III.

Result

 * 1) The film was permanently cancelled and was rebooted in 2014 with Teenage Mutant Ninja Turtles. The film was followed by a sequel titled Out of the Shadows.