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 live-action films.

Plot
The story would have a fifth turtle join the team named Jack Kirby. It would also included Fang, Shredder, Spyder, Nano Spyder, Talbot, Lawson, Bugman ,Super Shredder from Teenage Mutant Ninja Turtles II: The Secret of the Ooze, Casey Jones with electric powered fists, and a evil version of April O'Neil.

The only known information of the plot of the film was this:

"The fourth live-action TMNT film was pitched and originally scripted as a grittier, less kid-friendly adventure, and to that end Kevin Eastman designed a more brutish, hardcore fifth Turtle, named for the legendary King of Comics (Jack Kirby)."

Why It Was Cancelled

 * 1) Teenage Mutant Ninja Turtles III (1993) received very negative reviews.

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.
 * 2) The movie's scripts ended up being sold by Kevin Eastman through some auctions.

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