Ego is another character who has been in the Marvel Cinematic Universe, though his origin is different in the movie than in the comics. I loved Kurt Russell's portrayal of him. Hell, I love Kurt Russell period. In the movie he is Peter Quill's father (Starlord) though that's not the case in the comic books. Now we get to live with the thought of a planet having sex with a woman.
In the comic books Ego tells Thor that he was created when a scientist merged with a planet. Here we go, another scientist getting into trouble with his science experiments. After threat he started to consume planets, spaceships, and anything else he could get his planet-sized mouth around. That's when he got on Thor's radar, who came to defeat him so that he wouldn't destroy anyone's world.