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Michael O'Brien (Earth-616)

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Michael O'Brien (Earth-616) 001
Information-silkReal NameMichael O'Brien
Information-silkCurrent AliasMike O'Brien
Information-silkRelativesKevin O'Brien (brother, deceased); unnamed father[1]
Information-silkAffiliationFormer member of the Avengers Support Crew; NYPD, Guardsmen
Information-silkBase Of OperationsNew York City, New York; Formerly Project P.E.G.A.S.U.S., Adirondack Mountains, New York; The Vault, Rocky Mountains, Colorado; Avengers Mansion, Manhattan, New York City, New York
Information-silkIdentitySecret Identity
Information-silkMarital StatusSingle
Information-silkOccupationSecurity; formerly NYPD Sergeant
Information-silkHeight5' 11"
Information-silkWeight195 lbs (88 kg)
Information-silkOriginWhile investigating the death of his brother, Mike stumbled upon the Guardsman Armor.
Information-silkPlace of BirthChicago, Illinois
Information-silkCreatorsLen Wein, Herb Trimpe
First Appearance
Iron Man #82
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Michael O'Brien was a sergeant of the NYPD, and the brother of engineer Kevin O'Brien, who became the Guardsman and accidentally died while fighting Iron Man (who was in secret Michael's boss Anthony Stark). Although the police investigation exonerated Iron Man, Michael was completely unsure of it being a cover or not. He hired a P.I. to infiltrate in Long Island plant.

During his illegitimate investigation, Michael found the Guardsman Armor and donning it [2], deciding to use it to defeat Iron Man and took him to justice. However, the Guardsman Armor was defective and affected the brain, stimulating the areas the caused aggression, jealousy and hate (This had happened to Kevin too). Michael went crazy and changed his mind: He had to kill Iron Man.

Iron Man fought Michael and discovered the flaw in the armor. Iron Man then captured Michael himself, instead of pressing charges, because he wanted to convince O'Brien of his innocence.

Michael O'Brien (Earth-616)

As Guardsman

During this time, a saboteur had stolen most of Iron Man's armors, and Stark was working on a new design, but unfortunately the armor itself was not finished - it was too hot to wear it. At that moment, Japanese mutant Sunfire attacked, and Tony Stark was unable to use any of his traditional armors. Thus, he had to use the Guardsman armor. O'Brien witnessed Stark's heroics saving lives at a monitor, understanding that Stark was risking a heart attack, not to speak of brain damage.

O'Brien decided that he was wrong about Stark and put on Iron Man (now cold) armor to fight Sunfire. Due to this, O'Brien was mistaken with the true Iron Man by Iron Man's enemy Mandarin, who kidnapped O'Brien and took him to Chicago.

Stark found an old Iron Man armor ignored by the saboteur and went to rescue O'Brien. During the rescue, Stark revealed O'Brien his true identity and then fought the Mandarin. After this, O'Brien returned to New York with the Guardsman Armor. Stark then fixed the flaw on the Armor so that it could be used, and offered the armor to O'Brien. O'Brien then decided to use the armor to avenge his brother's bad actions and his own.

Eventually, Stark International was took over by criminal Midas. O'Brien, now the Guardsman, joined some of Iron Man's friends and allies to fight Midas. O'Brien was turned into gold by Midas' power, but eventually recovered.

O'Brien left the police and was interviewed to became head of security of Project P.E.G.A.S.U.S., the main energetic research post of the government, after the dismissal of their previous head of security, Quasar. With good references from Stark, O'Brien got the job.

Michael O'Brien (Earth-616) from Iron Man Vol 1 300

As Iron Man against Ultimo

O'Brien's Guardsman armor was damage in a battle with the Lava Men, but it was repaired at the expense of his employers. O'Brien has been working full-time at Pegasus since being hired.

Eventually, most of the tasks using super-villains at Pegasus were transferred to the Vault. O'Brien was also transferred and named security head of the Vault. The security agents also use copies of the Guardsman Armor, manufactured by Obadiah Stane under Stark's patent.

O'Brien also suited up with Bethany Cabe, Eddie March, Happy Hogan and Force to face Ultimo when asked by War Machine.

Without his armor, O'Brien was affiliated with Captain America (Steven Rogers) and the Avengers as part of the team's support staff.

Powers and AbilitiesEdit


Michael O'Brien has no powers of his own but they are derived from his Guardsman Armor. The Guardsman armor gives him the following powers:

  • superhuman strength.
  • life support.
  • durability.
  • sensors.
  • flight with boot jets.
  • repulsor blasters.
Power Grid [3]
Energy Projection*
Fighting Skills
* Heightened stats in armor

Strength level

With the armor, he is able to lift up to 40 tons.


O'Brien's Guardsman Armor was created by Tony Stark and is infused with Stark technology. The Guardsman Armor is inherently inferior to Stark's Iron Man Armor MK IV as well as all other versions of Iron Man armor.



Guardsman Armor. See Known Powers for the abilities of the armor.


Jet boots in the armor.


Repulsor blasters in the armor; police issue handgun


  • O'Brien is of direct Irish descent.

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