When Ego and 8-year-old Peter Quill begin their Celestial Expansion on Earth, S.H.I.E.L.D. founders Howard Stark and Peggy Carter form an Avengers-style team with Earths Mightiest Heroes from 1988. When Ego and 8-year-old Peter Quill begin their Celestial Expansion on Earth, S.H.I.E.L.D. founders Howard Stark and Peggy Carter form an Avengers-style team with Earths Mightiest Heroes from 1988.