- Script
- Jo Duffy (credited as Mary Jo Duffy)
- Pencils
- Jerry Bingham (credited)
- Inks
- John Stuart (credited) (pages 1-21); Al Milgrom (page 26, uncredited); Terry Austin (pages 31, 34, uncredited); ? (pages 22-25, 27-30, 32, 33)
- Colors
- Carl Gafford (credited as Carl Garford)
- Letters
- Jean Simek (credited as Simek) (pages 1-21); Janice Chiang (credited as Chaing) (pages 22-34)
- First Line of Dialogue or Text
- I am the Watcher, one of a race of timeless beings who have dedicated themselves to observing the events that transpire on all the myriad inhabited worlds across the universe.
- Genre
- science fiction; superhero
- Characters
- Watcher [Uatu]; X-Men [Angel [Warren Worthington III]; Beast [Hank McCoy]; Colossus [Peter Rasputin]; Cyclops [Scott Summers]; Havok [Alex Summers]; Iceman [Bobby Drake]; Nightcrawler [Kurt Wagner]; Phoenix [Jean Grey] (also as Dark Phoenix, also as Marvel Girl in flashback); Polaris [Lorna Dane]; Professor X [Charles Xavier]; Sprite [Kitty Pryde]; Storm [Ororo Munroe]; Wolverine [Logan]]; Shi'ar [Lilandra Neramani; Imperial Guard [Earthquake; Gladiator [Kallark]; Manta; Oracle [Sybil]; Smasher [Vril-Rokk]; Starbolt] (flashback)]; Galactus [Galan]; Terrax [Tyros]; Senator Robert Kelly; Sentinels; Aramans (aliens); Brotherhood of Evil Mutants [Avalanche [Dominikos Petrakis]; Blob [Fred Dukes]; Pyro [St. John Allerdyce]] (flashback); Firelord [Pyreus Kril] (flashback); Mastermind [Jason Wyngarde] (flashback); Henry Peter Gyrich (flashback)
- Reprints
- in What If? Classic (Marvel, 2004 series) #5
- in X-Men Winter Special (Marvel UK, 1981 series) #[1981] (1981)
- in Spidey (Editions Lug, 1979 series) #51 (10 avril 1984) [Pages 1-17], #52 (10 mai 1984) [Pages 18-34]
- in Superaventuras Marvel (Editora Abril, 1982 series) #37 (Julho de 1985)
- in Die Gruppe X (Condor, 1985 series) #10 (1987)
- in Best of What If (Marvel, 1991 series) (November 1991)
- in X-Men: Dark Phoenix Saga (Marvel, 2010 series) (June 2010)
- in True Believers: Phoenix - What if? (Marvel, 2018 series) #1 (February 2018)
- in X-Men: Dark Phoenix Saga Omnibus (Marvel, 2018 series) (2018)
- in What If? Classic: The Complete Collection (Marvel, 2018 series) #3 (2019)
- in Phoenix Omnibus (Marvel, 2021 series) #1 (2021)
- Keywords
- Avenger's Quinjet; Earth-81727; X-Men's Blackbird
Based on The X-Men (Marvel, 1963 series) #137 (September 1980). Additional inker and letterer information added 2005 by Steven Tice.