Narrator: If you look at Iron Man ... Mark 1, and compare it to the hero's nanotech suit from "Avengers: Endgame," a lot has changed. But it's not just the technology in the world of the MCU ...

According to concept artist Phil Saunders, director Joss Whedon presented him the challenge of retaining the feel of the Mark V suitcase suit (introduced in "Iron Man 2"), while giving Tony Stark ...