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Lilo & Stitch: Stitch Has a Glitch" is probably the best children's film I've seen that deals with mental illness. The first Lilo & Stitch introduces the character Stitch is an alien who was originally built to destroy:
"626 was designed to be a monster, but now he has nothing to destroy. You see, I never gave him a greater purpose. What must it be like to have nothing, not even memories to look back on in the middle of the night?"
But Stitch does find a greater purpose in becoming part of the family of a little Hawaiian girl named Lilo who tries and largely succeeds in taming his aggression.
Still, Stitch's bad past sometimes haunts him, and "Stitch Has a Glitch" opens up with Stitch having nightmares about his past. Lilo decides to help: "We need to test your goodness level. For example, someone bad would let this Elvis Blue Hawaii lamp . . . smash to pieces against that wall. Or let my favourite book, Plastic Surgeries Gone Wrong, drop out this window to be lost forever. Or let his family member fall to her painful, crushing death. No! See? Look at all the good things you did."
But there is something wrong with Stitch. When his eyes turn green, he starts misbehaving. No one knows what is wrong. But then they figure it out, during Stitch's creation, he wasn't fully charged, which caused the "glitch". "Now his circuits are going haywire. He can't control it."
Lilo's approach to Stitch's problems is to get him to act more like her hero, Elvis Presley, but the plan backfires as Stitch continues to behave poorly and anger many people in their community. Stitch tries to do good things to fill up his goodness level, but it doesn't compensate for the bad he has done in the eyes of his friends.
"You ruin everything."
"It's not my fault."
"Then whose fault is it?!"
Lilo decides to give Stitch one more chance, but only if he promises to do good. Unfortunately he has another bad episode and Lilo snaps at him, "I don't know why I ever believed you."
"Something wrong with Stitch," Stitch tries to explain.
"I know what's wrong with you. You're bad. And you'll always be bad."
The scientist tries to fix Stitch using science, but he can't. Stitch keeps getting worse until he decides to leave because he is too bad and too dangerous to be around the people he loves -- a subtle allusion to suicide that is done in a tasteful way that is still appropriate for small children by having Stitch try and fail to leave the planet on his spaceship. When Lilo finally catches up with him, she fears that it is too late:
"I'm so sorry. I kept saying how I needed you. But you needed me more. You're my ohana, Stitch. And I'll always love you."
In this case there is a happy ending, but there is often not a happy ending when people, family and friends struggle to deal with mental illness. But this film provides an excellent example of these struggles that all ages can relate to.