We discuss the third episode of Marvel's 'What if...?' What If... the World Lost Its Mightiest Heroes? Jeffrey Wright...The Watcher Samuel L. Jackson...Nick Fury Michael Douglas...Hank Pym / Yellow Jacket Lake Bell...Natasha Romanoff / Black Widow Mick Wingert...Tony Stark / Iron Man Clark Gregg...Agent Coulson Frank Grillo...Brock Rumlow Jeremy RennerStephanie Panisello...Betty Ross Mark Ruffalo...Bruce Banner / Hulk Tom Hiddleston...Loki