Groot is a fictional character appearing in American comic books published by Marvel Comics. Created by Stan Lee, Larry Lieber, and Jack Kirby, he first appeared in Tales to Astonish #13 (November 1960) as an extraterrestrial invader. The character was later reimagined as a heroic, tree-like humanoid with the ability to regenerate and manipulate plant life. Groot is best known for his extremely limited vocabulary, typically only uttering the phrase 'I am Groot,' though his close friend Rocket Raccoon can understand the nuanced meanings behind the words. After being reintroduced in the 2000s, Groot became a core member of the modern Guardians of the Galaxy, a team of cosmic misfits protecting the universe. His gentle nature, self-sacrificing tendencies, and unique design have made him one of Marvel's most beloved and recognizable characters.