Marvel's What If...? Trailer Sees Chadwick Boseman as T'Challa 1 Final Time

The premise behind Marvel's What If...? is basically what would happen if people took fan fiction seriously, and we couldn't be more thrilled. Ever wonder what would happen if Erik Killmonger was a hero who saved Tony Stark? Or what about if T'Challa was taken by Yondu instead of Peter Quill? Or how about if Peggy Carter, not Steve Rogers, became a super soldier? Those are just a few of the questions that the trailer for the upcoming Disney+ series answers.

And yes, a few of the live-action MCU stars will be returning to voice their animated counterparts. This includes the late Chadwick Boseman as T'Challa in one of his final performances, Hayley Atwell as Peggy, Chris Hemsworth as Thor, Tom Hiddleston as Loki, Michael B. Jordan as Killmonger, Michael Rooker as Yondu, Taika Waititi as Korg, Karen Gillan as Nebula, Sebastian Stan as Bucky Barnes, Samuel L. Jackson as Nick Fury, and more. It might just be one of the most stacked Marvel casts to ever exist. Check out the full trailer above before the show's premiere on Aug. 11.