X-51
Aaron Stack / Machine Man
- Also known as
Appearances
- Timeslip Collection #1 — 1998-11-00
- X-Force 1999 #[nn] — 1999-00-00
- Earth X Sketchbook #1 — 1999-02-00
- Thunderbolts #29 — 1999-08-00
- X-51 #1 — 1999-09-00
- X-51 #1 — 1999-09-00
- Avengers Forever #10 — 1999-09-15
- X-51 #3 — 1999-10-00
- X-51 #4 — 1999-11-00
- Peter Parker: Spider-Man #11 — 1999-11-00
- Captain America #23 — 1999-11-00
- X-Man #57 — 1999-11-00
- Generation X #57 — 1999-11-00
- Galactus the Devourer #3 — 1999-11-00
- X-51 #5 — 1999-12-00
- Earth X #1/2 — 2000-00-00
- X-51 #6 — 2000-01-00
- X-51 #7 — 2000-02-00
- Avengers United They Stand #5 — 2000-03-00
- New Warriors #6 — 2000-03-00
- Captain America #27 — 2000-03-00
- X-Men: Phoenix #3 — 2000-03-00
- Generation X #61 — 2000-03-00
- X-51 #8 — 2000-03-00
- X-51 #9 — 2000-04-00
- X-51 #10 — 2000-05-15
- Earth X #[nn] — 2000-12-06
- Earth X #[nn] — 2001-06-06
- Official Handbook of the Marvel Universe: Alternate Universes 2005 #[nn] — 2005-09-00
- X-Men vs. Apocalypse #2 — 2008-09-10
- Marvel Comics #1001 — 2019-10-02