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No - it was some weird obscure cartoon. I remember very clearly there was an English Sheepdog in it, and these purple things were under the thumb of the bad guy, and the main purple guy and his...

I don't think that's it - I'm not talking about the Arthur cartoon by Marc Brown that's on PBS. This was a movie that aired I think on HBO or something, and the creatures were definitely aliens or...

Okay, this sounds ridiculous, but I remember this movie from when I was a kid. It involved some human kids going into the forest at night and meeting up with these weird creatures - purple things...