The SpongeBob SquarePants Movie 2

The SpongeBob SquarePants Movie 2 was a proposed sequel to the 2004 film The SpongeBob SquarePants Movie and is supposed to be the second installment to the SpongeBob film series as well as the second film based on the television series with most of the cast reprising their roles and Stephen Hillenburg serving as the director.

Plot
The plot is supposed to be the same as Sponge out of Water, except with some changes.

Cast
Tom Kenny as SpongeBob

Bill Fragerbake as Patrick Star

Rodger Bumpass as Squidward Tentacles

Clancy Brown as Mr. Krabs

Mr. Lawrence as Plankton

Carolyn Lawrence as Sandy Cheeks

Why It Was Cancelled

 * 1) The producers thought the idea of a sequel wouldn't work.
 * 2) Nickelodeon decided not to allow any more sequels to Nicktoon-based films due to the critical and commercial failure of Rugrats Go Wild.
 * 3) Doing the script for the sequel was hard.

Results

 * 1) The sequel was permanently cancelled.
 * 2) Instead, Nickelodeon turned the sequel into a live-action/animated film, known as The SpongeBob Movie: Sponge Out of Water.