Disney+ renewed the series for a third season in July 2022, ahead of the start of the second season. A start date for the final episodes has not yet been announced.
The anthology series depicts an alternate history for Marvel with twists such as Peggy Carter (Hayley Atwell) becoming Captain America and T'Challa (Chadwick Boseman) becoming Star-Lord.
Actors from the Marvel films often lend their talents to provide voices for their animated counterparts. Others who appeared in multiple episodes include Jeffrey Wright, Terri Douglas, Matthew Wood, Robin Atkin Downes, Fred Tatasciore, Mick Wingert, Josh Keaton, Helen Sadler, Samuel L. Jackson, Lake Bell, Benedict Cumberbatch, Michael Ralph, Debra Wilson, Chris Hemsworth, Sebastian Stan and Piotr Michael.
Brad Winderbaum, Marvel Studios' Head of Streaming, Television and Animation, said the following about season three of Marvel's What If...? during the Official Marvel podcast:
“It feels like the completion of a trilogy. It takes us to places that you’d never expect. It goes beyond the first two seasons in its exploration of the multiverse. It pulls in characters that are very unexpected, and has what I think is an extremely moving and very fulfilling culmination for Uatu the Watcher.”
Wright, the voice of the Watcher (pictured above), also spoke about the series and said, “He’s not the Watcher that he was at the beginning. He’s a different Watcher now. He’s broken the fourth wall, so that’s wonderful because it gives a nice complexity to the character, and it also allows him to be active in ways that he wasn’t at the beginning of the series. It’s exciting stuff.”
The start date for the final episodes of the series will be announced later.