The Iron Man Armor: Mark XXVI, codenamed Gamma, was Tony Stark's twenty-sixth Iron Man suit and was an upgraded version of the Mark XXV, created for construction. It was a part of the Iron Legion and was destroyed during the Clean Slate Protocol.

The Gamma Armor was summoned, along with the rest of the Iron Legion, to help Tony Stark and James Rhodes during their fight against Aldrich Killian and his Extremis Soldiers. During the course of the fight, a number of armors were destroyed, though they eventually managed to eliminate all of the Extremis Soldiers. At the end of the battle, the remaining suits that were not destroyed by Extremis Soldiers were destroyed when Stark activated the Clean Slate Protocol, including the Mark XXVI.