Groot was freed from captivity by the "Mole Man", roamed Earth for quite some time, fought against the Incredible Hulk, along with a number of other Marvel Monsters. He went on to be recruited by the "Howling Commandos", that was a team compromised of monster-like heroes.
Some years later Groot started changing his ways and became a force for the good. He joined a team of space superheroes - Groot became best friends with Rocket Raccoon. Rocket dutifully waters a twig he took off Groot in yet another battle and Groot returns once more to join Starlord's revamp of the Guardians of the Galaxy. Groot eventually received his very own ongoing series, in which Groot and Rocket explore the far reaches of the galaxy.
Groot made an appearance in our very own neighbourhood on Hallowed Eve, protector of children, disguised for the evening of trick or treating. It sure was nice to meet him and when we shook hands, I felt a little twig settle in the palm of my hand, assuring me all children in his care would be safe during this night.