- Script
- Chris Claremont
- Pencils
- Dave Cockrum (loose blue pencils); Joe Rubinstein (credited as Josef Rubinstein) (finished art); Bob Wiacek (finished art)
- Inks
- Joe Rubinstein (pages 1-17, 23, 24, 29, 34, 36, 37); Bob Wiacek (pages 1-17, 23, 24, 29, 34, 36, 37)
- Colors
- Glynis Oliver
- Letters
- Tom Orzechowski (pages 1-36); Jean Simek (pages 37-48)
- Genre
- superhero
- Characters
- X-Men [Professor X; Cyclops; Storm; Wolverine [Logan]; Colossus; Nightcrawler; Sprite [Kitty Pryde]]; GUESTS: Carol Danvers [formerly Ms. Marvel]; Lee Forrester; Moira MacTaggert; Peter Corbeau; President Ronald Reagan; Brezhnev; VILLAIN: Magneto (origin); CAMEO FLASHBACK: Phoenix [Jean Grey] (death)
- Synopsis
- The X-Men find Cyclops and Lee at Magneto's ocean base. Cyclops re-joins. Battle royale with Magneto. Kitty performs a Jedi mind trick.
- Reprints
- in Spécial Strange (Editions Lug, 1975 series) #39 (10 mars 1985) [20 premières pages [First 20 pages]], #40 (5 juin 1985) [19 dernières pages [Last 19 pages]]
- in Superaventuras Marvel (Editora Abril, 1982 series) #53 (8 Novembro 1986)
- in Die Gruppe X (Condor, 1985 series) #10 (1987)
- in L'Uomo Ragno (Edizioni Star Comics, 1987 series) #35 (30 Ottobre 1989), #36 (15 Novembre 1989) [part 2]
- in X-Men Classic (Marvel, 1990 series) #54 (December 1990)
which is reprinted- in Essential X-Men (Marvel, 1996 series) #3 (July 1998) [black and white]
- in Wizard X-Men Masterpiece Edition (Marvel; Wizard, 2003 series) #1 (December 2003)
- in Marvel Masterworks: The Uncanny X-Men (Marvel, 2003 series) #6 ([January] 2008)
- in Marvel Gold. La Imposible Patrulla-X (Panini España, 2011 series) #3 - Vs. Magneto (Noviembre 2012)
- in The Uncanny X-Men Omnibus (Marvel, 2006 series) #2 (2014)
- in X-Men Epic Collection (Marvel, 2014 series) #8 - I, Magneto (2021)
Note 1: Inker and letterer page credits added 2005 by Steven Tice.
Note 2: Dave Cockrum reports 2006 that "I did loose pencils in blue. Editor Ann Nocenti referred to them as 'shakedowns'. But everything was there."
Note 3: Magneto seems to be living in something similar to the Lovecraftian sunken island/city of R'Lyeh.