Creation of a new Universe
Tony Stark when he had used the infinity gauntlet he had inadvertently created a new universe made from all of the things he liked that he saw throughout his life on TV like all of his favorite movies and TV shows all of them including Doctor Who even the ones he had yet to see up until 2023 and then future Doctor Who's. Himself as a young kid and all of his family members back then he brought into that universe along with all of his friends. Everybody from both universe woke up in the new universe and went on like business as usual living their lives and re-lived all of the events in all of their individual years only more prepared than previously before.