The third season of the animated Marvel series "What If...?" premiered on Disney+ on December 22, 2024. This season explores alternate timelines within the Marvel Cinematic Universe (MCU), showing what would happen if major events from the films occurred differently. It features fan-favorite characters such as Captain America/Sam Wilson, The Winter Soldier/Bucky Barnes, Hulk/Bruce Banner, The Red Guardian, Captain Peggy Carter, Agatha Harkness, and Shang- Chi, among others. The season consists of episodes with unique storylines, such as Hulk fighting mech Avengers, Agatha in 1930s Hollywood, Red Guardian stopping the Winter Soldier, Howard the Duck's family facing a cosmic power struggle, and more. The Watcher, voiced by Jeffrey Wright, continues as the narrator guiding viewers through the multiverse. The season is directed by Bryan Andrews and Stephan Franck, with a writing team including Matthew Chauncey, Ryan Little, and A.C. Bradley. It is part of Phase Five of the MCU and consists of daily episode releases from December 22 to December 29, 2024. Overall, the season expands on the multiverse concept with a mix of genres and spectacular alternate versions of MCU characters and stories.