Ego, also called Ego the Living Planet, is a Celestial in the Marvel Cinematic Universe that has a humanoid form . After millions of years after it came into existence, it learned to create and shape matter, creating a planet for itself to inhabit.
While seeking meaning, it began searching for life and altered its form so that it could mate with the life forms on the planets it visited. During its visits to Earth, it met and fell in love with a woman, and together they had a son named Peter Quill.
Ego was portrayed by Kurt Russel and appeared in Guardians of the Galaxy Vol. 2.