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, the armored adventurer, is one of Marvel's most iconic superheroes. From his days as a second-string hero behind Spider-Man and the Hulk to headlining multiple animated series and, ...