The designs and cool creatures that you see in Ghostbusters had to start somewhere. We have the amazing concept art of Henry Mayo to thank, as well as Thom Enriquez, John Deveikis and others. You can check it all out in Ghostbusters: The Ultimate Visual History. We’ve mentioned the book before, but check out some of the images here.

Witness some of the drawings that led to the creation of the Stay Puft Marshmallow Man and Slimer. I’m always fascinated with how these things evolve. It’s interesting to see the creative process. I almost wish we had gotten a more evil looking Stay Puft Marshmallow Man after seeing this.

via io9