Following is a transcript of the video. Narrator: If you look at Iron Man's first suit, the Mark 1, and compare it to the hero's nanotech suit from "Avengers: Endgame," a lot has changed.

Iron Man is an iconic character in the Marvel Universe, and these are the most powerful versions of the character.

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 ...