The "What If...?" TV series is an American animated anthology series produced by Marvel Studios for Disney+. It explores alternate timelines in the Marvel Cinematic Universe (MCU), imagining what could happen if major events in the MCU films occurred differently. The series is narrated by the Watcher (voiced by Jeffrey Wright) and features many MCU film actors reprising their roles. It debuted in August 2021 and has aired three seasons, with the storylines incorporating the multiverse concept introduced in other MCU projects like "Loki." The series is known for its cel-shaded animation style and creative storytelling, providing unique variations on well-known MCU characters and events.

There is also a separate thriller miniseries titled "What/If," which is unrelated to Marvel and focuses on morality tales revolving around the consequences of fateful decisions. This series premiered on Netflix in 2019.

In summary, "What If...?" is primarily recognized as the Marvel animated series exploring alternate MCU realities through the multiverse concept.