Changeling
Kevin Sidney
- Also known as Master,Number Two
Appearances
- The X-Men #35 — 1967-08-00
- The X-Men #36 — 1967-09-00
- The X-Men #37 — 1967-10-00
- The X-Men #38 — 1967-11-00
- The X-Men #39 — 1967-12-00
- The X-Men #40 — 1968-01-00
- The X-Men #41 — 1968-02-00
- The X-Men #42 — 1968-03-00
- The X-Men #43 — 1968-04-00
- Fantastic! #69 — 1968-06-08
- The X-Men #65 — 1970-02-00
- Tales of the Teen Titans #78 — 1987-06-00
- The Official Handbook of the Marvel Universe: Master Edition #28 — 1993-00-00
- X-Men The Hidden Years #1 — 1999-12-00
- X-Men The Hidden Years #8 — 2000-07-00
- Official Handbook of the Marvel Universe: X-Men 2005 #[nn] — 2005-00-00
- Official Handbook of the Marvel Universe: Book of the Dead 2004 #[nn] — 2005-01-00
- Marvel Legacy: The 1960s Handbook #1 — 2006-02-00
- Mystic Arcana: The Book of Marvel Magic #[nn] — 2007-08-00
- X-Men #200 — 2007-08-00
- Marvel Masterworks: The X-Men #4 — 2011-11-23
- Uncanny X-Men #27 (727) — 2026-06-00
- Generation X-23 #3 — 2026-06-00
- X-Men #29 (338) [329] — 2026-07-00
- X-Men United #3 — 2026-07-00