Peter Quill's cosmic lineage -- see also: the reason he could handle the Power Stone without painfully exploding -- was unveiled when a Celestial, the living planet Ego, revealed that he was Peter's father. Which made Star-Lord half-almighty alien. Of course, Peter was only created so that Ego could double up on his own power and spread himself, literally, across the entire universe. And while that sounds pretty terrible, it somehow doesn't compare to the cruelty of Ego purposefully giving Peter's mom cancer.
10/10