4.5 stars. 
 Cardboard contains a number of monsters, though I didn't want to make a shelf just for that. It didn't really fit in the supernatural, sci-fi, or fantasy shelves either. So, action-adventure and quirky-whacked will have to suffice in encompassing the oddness that is tons of sentient creatures made from cardboard, most of them filled with evil intentions. And it all started with an unemployed, widowed dad who only had 78 cents with which to purchase his son a birthday present. Turns out, that is just the price for one magical cardboard box, and the story develops from there. 
 Doug TenNapel knows how to write weird, captivating, and very nicely-drawn graphic novels. This is one of my favorites, even though the ending is pretty predictable. My 12 year old also liked it a lot, and would give it 4-4.5 stars.