I vividly remember a film from when I was a kid and I keep wondering if anyone knows what it was.
I remember that all the characters (I think they were humans) had a light in the center of their heads. They had to stay in regulated areas of the planet. If they tried to escape, they were shot by the guards and the weapons turned them into to some sort of chocolate milkshake-looking mush.
As far as I recall the hero did escape (possibly with the love interest) and his light went out but he survived?
Ring any bells?