Doreen Green is a fictional character from the Marvel Comics universe, known for her superhero identity as Squirrel Girl. She first appeared in Marvel Super-Heroes #8 in 1991. Doreen possesses the unique ability to communicate with squirrels and has enhanced agility and strength, making her a formidable opponent in battles. Doreen is often portrayed as a college student who balances her academic life with her superhero activities. She is recognized for her upbeat personality and her ability to defeat powerful villains, including Thanos and Doctor Doom, often using her intelligence and resourcefulness rather than brute force.