Chicken Little 2: Mission To Mars

Chicken Little 2: The Ugly Duckling Story was a planned sequel to the 2005 animated Disney film, Chicken Little.

Plot
The story would involve Chicken Little in the middle of a love triangle between his childhood sweetheart, Abby Mallard, and a very attractive newcomer, a French sheep named Raffaela. Being at a great disadvantage, Abby would go to great lengths to give herself a makeover.

Why It Was Cancelled

 * 1) The first film received mostly mixed to negative reviews from critics and audiences, so Disney decided not to make the sequel.
 * 2) When John Lasseter became Walt Disney Animation Studios' new chief creative officer, he called for all sequels and future sequels that DisneyToon had planned to be cancelled.

Result
The sequel didn't come to surface nor was it announced for a DVD release.