From the back of the book:
Inside: a guide to the Marvel Universe’s nuttiest superheroine!
Let this fan-made handbook from the Marvel Superheroes Unofficial Canon Project be your sourcebook for all things Squirrel Girl, for use with the Classic Marvel (FASERIP) RPG rules. You’ll find the complete history of Squirrel-Girl, from aspiring sidekick to downright Unbeatable, statistics for Squirrel Girl’s friends, foes, and gadgets, and plot seeds (or are they acorns?) for including Doreen Green and her friends in your own RPG campaign.
“Let’s eat nuts, and kick butts!”