Bingowings said:

Coraline (2009).

It's inevitably not an accurate depiction of the darkness of the source material but it's still pretty dark stuff for an animated film primarily aimed at children.

The voice acting is good and the animation style is bold.

If you want explain Gnosticism to your kids it's probably the easiest way.

4 Balls.

Definitely the darkest plot twist I've ever seen in a kid's movie. And the main reason I scream hysterically when a commercial comes on for those creepy button eyed dolls. ;)

Why the heck haven't I bought this on Blu Ray yet?