So, I watched a bit of this movie the other day, a 1973 French cartoon called La Planete Sauvage. I only saw part of it because I got super creeped out by it, but the part that I did see was very reminiscent of Lilith's Brood to me. Humans are toyed with, what it is to be human is questioned, superior and uncaring aliens screw around with human lives, the whole bit.
I think you can find most of it dubbed over into English on youtube. Watch it if you want to feel like you are on hard drugs.