The Mark III (Mark 3) was the third Iron Man Armor designed and created by Tony Stark and is the successor to the Mark II. The armor was designed with upgraded technology and improved features to surpass it’s predecessor’s capabilities. It’s also the classic armor.
The strongest of the armors in Iron Man, it was designed for customization. The Mark III was equipped with a variety of incredible enhancements and upgrades. It was heavily damaged at the end of the first Iron Man by the Iron Monger. It was later succeeded by the Mark IV.
Even though it was not used in Iron Man 2 it was put in the Hall of Armors with the original 7 armors. Also, the suit has flares and strong repulsors, along with more tank missiles. The Mark III appears in Iron Man 3 along with other 6 armors in Tony’s garage, and also after where it is destroyed when a terrorist attack occurs in Tony Stark’s Malibu Mansion.