With her unique combination of wit, empathy and squirrel powers, computer science student Doreen Green is all that stands between the Earth and total destruction. Well, Doreen plus her friends Tippy-Toe (a squirrel) and Nancy (a regular human). So, mainly Squirrel Girl. Then: what hope does Earth have if she gets hurled back in time and erased from history? Some hope, hopefully, as Howard the Duck is waiting impatiently for a crossover! COLLECTING: THE UNBEATABLE SQUIRREL GIRL (2015B) #1-11, HOWARD THE DUCK #6.