Marvel's "What If...?" is an American animated anthology television series created by A. C. Bradley for Disney+. It is part of the Marvel Cinematic Universe (MCU) and explores alternate timelines in the multiverse, showing what would happen if major moments from the MCU films occurred differently. The series features the Watcher as a narrator and includes many MCU film actors reprising their roles. The show takes pivotal moments from throughout the MCU and changes them, creating new and distinct parallel worlds with unique storylines. As an anthology, each episode presents a different "what if" scenario that alters the course of events familiar to MCU fans. The series premiered its first season in August 2021, followed by a second season released in December 2023, and a third and final season in December 2024. It is praised for its creative storylines, voice acting, and animation style inspired by the MCU films. Additionally, there is an interactive mixed reality experience titled "What If...? – An Immersive Story" for the Apple Vision Pro headset, in which users collect Infinity Stones and meet multiverse variants of MCU characters. Overall, "What If...?" explores the infinite possibilities of the MCU multiverse through animated alternate realities, allowing fans to see their favorite characters and stories in new and unexpected ways. If you want to know more details about specific episodes, characters, or storylines, I can provide that as well.