I'm a big fan of this series. The characters are unique and well detailed, and there is an incredible amount of story-rich material packed in just a few pages, with a high-quality piece of character art to top all of it off. Action Jack is your average Joe who turns into a two-fisted pulp hero whenever someone utters a special phrase. He is designed for pre-WWII-era pulp settings, but could easily appear in other pulp hero style settings as well.
This product is systemless, so that you can use it with the RPG system of your choosing.