He is Groot. We know that much, but what else do we know about this regenerative sentient tree-being and Guardian of the Galaxy?
In Tales to Astonish (1959) #13
Did you know that Groot was once a hulking monstrosity and ruler of Planet X? It’s true! The arboreal antagonist first appeared in this Silver Age tale, and was actually quite chatty!
In Annihilation: Conquest - Starlord (2007) #1
Before he was an official Guardian of the Galaxy, King Groot featured as one of Star-Lord’s resistance fighters against the Ultron-led Phalanx in ANNIHILATION: CONQUEST. And, after being regrown from a sapling following a near-death experience, Groot had a new catchphrase.
In Guardians of the Galaxy (2008) #1
A modern-day Guardian! In the first comic series starring the blockbuster team, sapling Groot is under the protection of his best friend Rocket, but proves to be a mighty asset once he starts to branch out!
In Guardians of the Galaxy (2013) #21
What happens when Groot inadvertently bonds with the rogue Venom symbiote of Flash Thompson? Nothing good. Read through issue #22 to see a Venomized Rocket too!
In Guardians of the Galaxy (2015) #1
Rocket and Groot are side-by-side throughout this fast paced run that saw the Guardians battle it out through CIVIL WAR II under the leadership of Star-Lord: Kitty Pryde. They even manage to survive a “grounding” on Earth!
In Guardians Team-Up (2015) #8
Co-starring the Silver Surfer! A crippled spaceship with a million beings on board. A ruthless force, blasting it all to the ground. And in the middle: Groot and the Sentinel of the Spaceways, teamed up for a visually stunning rescue.
In Rocket Raccoon & Groot (2016) #1
If you love adventure, animals, and outer space capers, you’ll love this galactic road comedy starring Rocket and Groot. Skottie Young and Filipe Andrade unite for some tall tails across the stars!
In Groot (2015) #1
When he’s separated from Rocket on a road trip-gone-awry, Groot breaks out on his own to save his friend from space pirates or space prison. Either way, Rocket’s in trouble.
In I Am Groot (2017) #1
When the Guardians get caught in a wormhole, a smaller-than-normal Groot is separated billions of light-years from the team! Falling to a planet below, Groot discovers an alien world full of strange societies. Seriously underdeveloped and with nobody who can understand him, Groot makes the journey to the center of this world to find the way back to his family.
In All-New Guardians of the Galaxy (2017) #1
In this tie-in series to I AM GROOT, tiny Groot faces his weirdest misadventures yet when the Guardians fall on the wrong side of the Nova Corps AND get swept up in a squabble between Elders of the Universe the Collector and the Grandmaster.
In Infinity Countdown (2018) #1
In this entry series to INFINITY WARS, Groot’s natural speech is restored (however briefly) by an ancient being in his debt. Itty bitty Groot becomes a tree-man once more!
In Guardians of the Galaxy (2019) #1
Thanos of Titan is dead... or is he? The universe is ablaze as hundreds of worlds go to war in the chasm of Thanos' loss. And a (vocal) Groot and company are addressing this power vacuum head on.
In Guardians of the Galaxy (2020) #1
A new team, a new mission, and a new set of maniacal space gods to fell. Groot and the gang are back in this excellent entry point series. (And still sporting a killer mohawk.)