Michael O'Brien

    Character » Michael O'Brien appears in 157 issues.

    Michael o'Brien was a police sergeant who believed Iron Man was responsible for his brother's death. After fighting Iron Man as the Guardsman, he discovered his mistake and became an ally to Iron Man and the Avengers. He acted as Iron Man briefly and fought Sunfire and the Mandarin.

    Short summary describing this character.

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    Brief History

    O' Brien, New York City police sargeant, didn't believe that his brother, Kevin, died accidentally in battle with Iron Man. He re-opened the case without authorization believing that there was a cover up of Iron Man's actions. O' Brien managed to get access to the Guardsman armor and put it on hoping to go after Iron Man. O' Brien was affected by the faulty cybernetic circuitry and as the Guardsman, insane with rage, attempted to kill Iron Man. During the battle, Guardsman was convinced by Iron Man that the armor had a malfunction that caused irrational behavior. Iron Man removed the Guardsman armor from O' Brien and took O' Brien into his custody rather than turn him over to the police.

    After two separate battles with Sunfire and the Mandarin, Iron Man revealed that he was Stark to O' Brien. Stark repaired the malfunction in the Guardsman's cybernetic circuirty and the Guardsman hoped to make up for past mistakes. The Guardsman continued to be a reliable ally to Iron Man.

    Later, the Guardsman was the security director at Project: Pegasus but resigned a few years later and came to work for the Avengers as part of the support staff. Years later, O' Brien was contacted by War Machine who was recruiting close friends of Iron Man to fight Ultimo.

    The Guardsman was later stationed at the Super Villain Peniteniary known as the Vault.

    Publication History

    Michael O' Brien first appeared as himself in Iron Man vol 1 #82 and then first appeared as the Guardsman in Iron Man vol 1 #97.

    Powers and Abilities

    Guardsman Mark I

    30 Minute Self Contained Atmosphere

    Cybernetic Interface & Battle Computer

    Chemical Fueled Boot Jets

    Rechargeable Power Supply

    Palm Repulsors

    Guardsman Mark II

    Short-Range Broadcast Power Batteries

    15 Minute Emergency Battery Backup

    Cybernetic Interface & Battle Computer

    Chemical Fueled Boot Jets

    Energy Dampening Field - Protected Armor from a strike that cracked a Mark I's shell.

    Palm Repulsors (Enhanced)

    In Other Media



    • Guardsman was featured in the Minimates line from Diamond Select.
    • Guardsman was featured in the HeroClix figure game.
    • Crimson Dynamo was featured in the Iron Man: Armored Adventures line from Hasbro.

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