Uatu is a fifth-dimensional being who observed the Multiverse from the Observational Plane. Taking an oath that prohibited him from interfering with events occurring within the Multiverse, Uatu joined the Order of the Watchers and stepped into his role as a Watcher. This changed when an Infinity Stones-wielding Ultron sensed his presence and learned of the Multiverse, thus forcing him to violate this oath in order to protect the numerous timelines threatened by the omnicidal AI. Recruiting Captain Carter, Star-Lord, Strange Supreme, Erik Killmonger, Gamora, Thor and later Black Widow as the Guardians of the Multiverse, they were successful in preventing Ultron from advancing his devastation across the Multiverse. Watcher returned to his job of watching many alternate universes. He went to watch Groot fulfill a prophecy before going to several universes such as Nova Corpsman Nebula Universe, Celestial Invader Ego Universe and Gamma Enhanced Happy Hogan Universe. He also returned to Sakaarian Iron Man Universe to review the story that led up to Gamora's involvement in the Battle for the Multiverse. However, Uatu found himself wanting to check up on Captain Carter, despite usually not doing sequels. He then surveyed Kahhori and a Merciful Hela Universe before seeing how Captain Carter got involved in the Forerunner Steve Rogers Universe universe. Uatu tried to get her out, but watched as Carter saved the universe before being rescued by Doctor Strange, who had been gathering many multiversal beings to feed his Forge and recreate his universe. Uatu watched as Carter stopped Strange. He then returned Carter to her universe, but not before making a detour to the Observational Plane. As he continued to observe the Multiverse, Watcher discovered that Wanda Maximoff had been impersonating him with hopes of convincing an individual to collect the Infinity Stones for her from various universes. The individual defeated Maximoff, and Watcher presented them with the choice to either use the stones to help their allies or destroy them. Watcher commended the version of the individual who destroyed the stones and introduced them to Captain Carter. He then began talking to the version who kept the stones and tried unsuccessfully to prevent them from being recruited to the Time Variance Authority. Resuming his multiversal watching, Watcher found it harder not to intervene again, ultimately breaking his oath once more to save Riri Williams which drew the ire of the other Watchers led by his old mentor, Eminence. Watcher went on to break his oath several more times, including to save Reed Richards, Nick Fury, Madisynn King and Kwai Jun-Fan, causing the other Watchers to place him on trial for his actions. Watcher was rescued by the new Guardians of the Multiverse and a second Infinity Ultron, leading to a battle between the Watchers and the Guardians. Reclaiming his identity as Uatu, Watcher turned the Guardians into fellow Watchers. Carter made the ultimate sacrifice to save her friends, transporting everyone to Strange Supreme's universe, where the Watchers were rendered powerless. Uatu suggested that Eminence, Incarnate, and Executioner could learn by watching over life in this new universe and invited Kahhori, Byrdie the Duck, and Storm to join him in protecting the Multiverse. He would resume his watching shortly afterwards as he would witness a conversation between a variant of Spider-Man and Doctor Strange