- Script
- Chris Claremont (plot, script); John Byrne (plot)
- Pencils
- John Byrne
- Inks
- Terry Austin
- Colors
- Glynis Oliver
- Letters
- Tom Orzechowski
- First Line of Dialogue or Text
- Arrghh!
- Genre
- superhero
- Characters
- X-Men [Professor X; Storm; Wolverine [Logan]; Angel [Warren Worthington III]; Colossus; Nightcrawler; Sprite [Kitty Pryde]]; GUESTS: Cyclops; Lee Forrester (first appearance); Mariko Yashida; Carmen Pryde; Terri Pryde; Douglas Moore (death); Ellie Moore (death); VILLAIN: N'garai demon (first appearance, death)
- Synopsis
- Kitty is left home alone on Christmas Eve and tangles with a nasty demon.
- Reprints
- in The Mighty World of Marvel (Marvel UK, 1982 series) #3 (August 1983)
- in Ryhmä-X (Semic, 1984 series) #11/1985 (1985)
- in Superaventuras Marvel (Editora Abril, 1982 series) #42 (8 Dezembro 1985)
- in Die Gruppe X (Condor, 1985 series) #9 (1987)
- in L'Uomo Ragno (Edizioni Star Comics, 1987 series) #26 (15 Giugno 1989) [pages 1-17], #27 (30 Giugno 1989) [pages 18-22]
- in X-Men Classic (Marvel, 1990 series) #47 (May 1990)
which is reprinted- in Essential X-Men (Marvel, 1996 series) #2 ([August] 1997) [black and white]
- in X-Men (Marvel, 1991 series) #109 (February 2001)
- in Wizard X-Men Masterpiece Edition (Marvel; Wizard, 2003 series) #1 (December 2003)
- in Marvel Holiday Special 2004 (Marvel, 2004 series) (2004)
- in Marvel Masterworks: The Uncanny X-Men (Marvel, 2003 series) #6 ([January] 2008)
- in Marvel Gold. La Imposible Patrulla-X (Panini España, 2011 series) #2 - Días del Futuro Pasado
- in Marvel. Официальная коллекция комиксов (Ашет Коллекция [Hachette], 2014 series) #11 - Люди Икс: Дни Минувшего Будущего
- in The Uncanny X-Men Omnibus (Marvel, 2006 series) #2 (2014)
- in Universo Marvel (Levoir, 2014 series) #9 - X-Men: Dias de um Futuro Esquecido
- in X-Men Epic Collection (Marvel, 2014 series) #7 - The Fate of the Phoenix (2021)
- in X-Men - La Collection Mutante (Hachette, 2020 series) #43 - Days of future past (mai 2022)
This issue's story is the first of scriptwriter Chris Claremont's many homages to the 1979 film "Alien" in the X-Men series.
- Script
- Chris Claremont (responses)
- Letters
- typeset
- Reprints
Letters of comment by Dr. Phillip S. Kott, Kurt Busiek, and Mark Yanko. Includes farewell to John Byrne and Terry Austin by Chris Claremont and "The Mighty Marvel Checklist!"