Madagascar 4

Madagascar 4 was supposed to be the fourth entry in the Madagascar franchise. However, production was halted when Anne Globe stated that it was too early to tell. Despite work being done on the film, it was removed from its May 18, 2018 release schedule.

Plot
The plot is currently unknown, but probably it would focus around our main heroes Alex, Marty, Gloria and Melman being tired of being in captivity and trying to return to Africa.

Why It Was Cancelled

 * 1) The film was removed from the schedule.
 * 2) In 2014, The Penguins of Madagascar was released in theaters.
 * 3) The voice cast were pretty happy to walk away from another film according to David Schimmer.

Results

 * Madagascar 4 was permanently cancelled.
 * The Madagascar franchise ended up being a trilogy.