Over 17 years and dozens of movies and TV shows, Marvel Studios has made a series of meaningful retcons to the MCU.

SEE ALSO: How Much Would It Cost to Be Iron Man 3 in Real Life ... his back. Instead of an arc reactor embedded in Browning's chest, the propulsion suit is powered by highly flammable liquid ...

One of the greatest battles that I have ever seen from Iron Man and the Avengers was when ... Tony creates a specialized armored suit powered by an arc reactor, which keeps him alive.