The Cat in the Hat Comes Back

The Cat in the Hat Comes Back was the planned sequel to the 2003 film The Cat in the Hat with Mike Myers returning as the title character.

Plot
The Cat returns to Conrad and Sally's place, while their mother is out doing errands. Rest unknown.

Cast
Rest unknown
 * Mike Myers as The Cat in the Hat
 * Dakota Fanning as Sally
 * Spencer Breslin as Conrad
 * Kelly Preston as Joan Walden
 * Victor Brandt as the Narrator

Why It Was Cancelled

 * 1) The first film was panned by critics, audiences and fans of the character alike.
 * 2) The film failed at the box office.
 * 3) Fans of the book were offended about how many adult jokes were in the first film.
 * 4) Dr. Seuss' widow banned all future live-action adaptations of her late husband's work after expressing distaste for the film.
 * 5) Both Spencer Breslin and Dakota Fanning are too old to reprise their roles as Conrad and Sally respectively.
 * 6) Mike Myers didn't want to play the title character again.

Results

 * The sequel was permanently cancelled and the first film is a stand-alone film.
 * There were plans for an animated adaptation of The Cat In The Hat  and its possible sequel, which were announced by Universal Pictures and Illumination Entertainment, following the success of The Lorax. However, further plans to the film weren't announced since then and the project was replaced by The Grinch.
 * In January 2018, the Warner Animation Group announced that they have picked up the rights for the animated Cat in the Hat reboot movie, along with many of Seuss' works. However, it is currently unknown who will be cast in the reboot film.
 * There are three animated theatrical films released, Horton Hears A Who (2008) (by Fox and Blue Sky), The Lorax (2012) and How The Grinch Stole Christmas (2018) (by Universal and Illumination).
 * A Dr. Seuss Cinematic Universe was formed by Universal starting with The Lorax on March 2, 2012 (to celebrate Dr. Seuss' 108th birthday) and then How the Grinch Stole Christmas on November 9, 2018 (which was Illumination's final DSCU film). The Cat in the Hat reboot will be the third installment and will be the first DSCU movie released under the Warner Animation Group as part of Seuss Enterprises' new deal with Warner Bros.
 * A television series titled The Cat in the Hat Knows a Lot About That was commissioned by PBS Kids.