Growing up we all had our share of Don Bluth movies, and when you think about them now they are all, well, awful. Just awful. Not the art or the story, but the whole... like you showed this to children?! This is traumatic! It's much worse then the forced orphan story in every Disney movie... that said, there was one that despite being a bit strong, was still awesome as hell:
Humanity was attacked by the Drej, an alien race made of pure energy, which in fear of us decides to destroy the Earth. They are successful but some manage to escape, along with a ship called the Titan, which has the ability to simulate another big-bang, thus giving life to a new planet. The Titan is hidden by its inventor and both humans and the Drej seek to find it before the other. The key to the Titan is on Cale's hands, the son of the inventor of the Titan. Cale must hurry to reach it before the Drej do, who seek, after all these years to wipe out humanity.
Watch it? I highly recommend it. Yes, a lot of people die and yes, there are some parts of that still scare the shit out of me... I don't know if I would show it to children, but it is definitely a movie that has aged well, keeping its magic with a story that in a world of alien attacks coming from every angle is still creative and unique. I would definitely include it on a bucket-list of apocalyptic movies!
Until the next item on my list!