Michael O'Brien
Guardsman, Marvel
- Also known as Michael O'Brian
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.
Appearances
- Iron Man #104 — 1977-11-00
- Marvel Super Hero Contest of Champions #1 — 1982-06-00
- The Avengers #236 — 1983-10-00
- The Avengers #237 — 1983-11-00
- Power Man and Iron Fist #113 — 1985-01-00
- Iron Man Annual #8 — 1986-10-00
- The Avengers #300 — 1989-02-00
- Captain America #352 — 1989-04-00
- Captain America #353 — 1989-05-00
- Captain America #354 — 1989-06-00
- Captain America #358 — 1989-09-00
- The Avengers Annual #18 — 1989-10-00
- Captain America #363 — 1989-11-00
- The Avengers #311 — 1989-12-00
- Quasar #5 — 1989-12-00
- The Avengers #319 — 1990-07-00
- Captain America #372 — 1990-07-00
- The Avengers #320 — 1990-08-00
- Captain America #374 — 1990-08-00
- The Avengers #323 — 1990-09-00
- The Avengers Annual #19 — 1990-09-00
- The Avengers #325 — 1990-10-00
- The Avengers #324 — 1990-10-00
- Captain America #380 — 1990-12-00
- The Avengers #329 — 1991-02-00
- The Avengers #330 — 1991-03-00
- Captain America #383 — 1991-03-00
- The Avengers #331 — 1991-04-00
- Quasar #28 — 1991-11-00
- Captain America #405 — 1992-08-00
- Captain America #404 — 1992-08-00
- Captain America #422 — 1993-12-00
- Avengers 1999 #[nn] — 1999-07-00
- Avengers: The Contest #[nn] — 2012-05-16
- Marvel Platinum: The Definitive Captain America Reloaded #[nn] — 2014-00-00
- Avengers Epic Collection #20 — 2021-00-00
- Iron Man Epic Collection #7 — 2025-06-04
- The Invincible Iron Man Omnibus #4 — 2026-05-27