Comrade X
Nina Vladimirovna Tsiolkovsky, Marvel
- Also known as Madame X
Appearances
- Tales to Astonish #36 — 1962-10-00
- Marvel Collectors' Item Classics #1 — 1965-12-00
- Marvel Super-Heroes #16 — 1968-09-00
- West Coast Avengers #36 — 1988-09-00
- Marvel Legacy: The 1960s Handbook #1 — 2006-02-00