The Mark 21 (XXI), also known as "Midas", is a High-Altitude Suit, and was one of the many newly-built suits created by Tony Stark sometime after the events of The Avengers.
It was featured in the movie Iron Man 3, and made its debut in the movie when Tony ordered J.A.R.V.I.S. to initiate the "House Party Protocol", in which it was was activated along with all the other suits to aid Tony in his battle with Aldrich Killian.
The suit earned it's name "Midas" because of its color. Midas is a figure from Greek mythology who was granted the his wish to turn anything he touched into gold. It also has the ability to fly at high altitudes, being designed to withstand low pressure and cold temperatures.
The Mark 21 may have been a prototype of the Mark 39 suit as the functionalities that they bear are quite similar. While the Mark 21 has the ability to fly at high altitudes, the Mark 39 has a more advanced system, that enables it to venture into space.
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