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.

While the Hulkbuster suit isn't Tony Stark's first design, it's famous for ... knife of Tony's armor collection. Model 51 piggybacked off Iron Man's other nanotech armors (like the Bleeding ...