Marvel’s What If…? will feature nearly all the stars from the Marvel Cinematic Universe

Entertainment Weekly

Marvel Studios chief Kevin Feige revealed at Disney's D23 that “almost the entire cast of the MCU will be lending their voices" to the Disney+ animated series. He also elaborated on the show's premise, saying: "The 23 films of the MCU that you know are going to showcase one little difference in each episode and see how things change.”