The Ancient One (left): A powerful Sorcerer Supreme and protector of the Time Stone on Earth. She died in 2016 during the events of Doctor Strange. Odin (center): The Allfather of Asgard, a formidable warrior, and the one who held Hela at bay through his life force. He died in Norway in Thor: Ragnarok, which took place in 2017. Yondu Udonta (right): A Ravager leader with a powerful Yaka Arrow weapon. While not on the same power scale as Odin or the Ancient One, some fan theories humorously include him as one of the threats Thanos waited out, or point to other cosmic beings like Ego (who died in Guardians of the Galaxy Vol. 2 in 2017).

Who are they?