All right it's a movie from the 80's I believe. It was a guy who somehow goes into this cartoonish world.. Drawings sort of looks like the video "day and night" by Kid Cudi. All right well the cartoon world get mixed up or is taking over the real world... and the guys stop it with a crystal at the end I believe. And there's this blonde cartoon and she turns human... Known actress but I forgot her name too... Imma try to remember more parts to help out..

I think the movie you are looking for is "Cool World" it has Kim Basinger and Brad Pitt in it.