Matthew Chauncey was the story editor for What If...?, wrote the episode "What If... T'Challa Became a Star-Lord?" and "What If... Zombies!?" and co-wrote "What If... The World Lost Its Mightiest Heroes?" with A.C. Bradley.
Chauncey also co-wrote the teleplay of Ms. Marvel episodes "Destined", "Seeing Red" and "No Normal".