The original concept [of Cool World], way back when I sold the film, was that a live action cartoonist would go to bed with a cartoon woman in the cartoon world. They had a child immediately that was a strange combination of live action and animation in one character. This son of the underground cartoonist hates himself for what he is and isn't and goes back to the real world to track his father down. The picture was originally an R rated horror film. Slash and the rest of the characters in Cool World were just friends of Holli and looked nothing like their child.