Groot is an extraterrestrial plant monster who initially came to Earth seeking humans to capture and study. Groot was seemingly destroyed by termites used by Leslie Evans. Xemnu made a duplicate of Groot that was used to fight the Hulk but it was destroyed in the battle.
Groot was later revealed to have survived, but was a captive of the Collector and held in his zoo in Canada until Groot and the other captive creatures were freed by the Mole Man. Groot and the other creatures rampage in New York City until they are stopped by a band of superheroes, and are dumped through a portal to the Negative Zone.
Groot was later tracked down and captured by S.H.I.E.L.D.'s Paranormal Containment Unit, nicknamed the Howling Commandos.
While Groot was being held captive, Gorilla-Man talked to Groot about joining the Howling Commandos.When Merlin and his forces attacked the base, the Howling Commandos let Groot and their other captives free and they stampeded Merlin's army; Groot was the only one to turn back and offered to join the Howling Commandos.
Can you find our very own Groot on the Pipe Track?