Magnus: Robot Fighter and The Iron Giant
I have always though that Brad Bird's The Incredibles was worthy of a sequel, and I am glad that one is finally in motion.  Bird's other animated classic, The Iron Giant, is another story.  As much as I love the film, I think that it is perfect just as it is.  I think this is a definite case where the story is so perfectly told that a sequel is unnecessary.

http://braveandboldlost.blogspot.com/2015/12/magnus-robot-fighter-and-iron-giant.html