The X-Men #125
☆ Be the first to review + Add to your collection — Join freeThe X-Men #125 (September 1979) is the opening chapter of the Proteus Saga, one of the defining Bronze Age X-Men story arcs, and marks the first on-page appearance of Mutant X — the reality-warping mutant who would formally name himself Proteus across the following issues. The issue also carries enormous narrative freight beyond that debut: it contains Jean Grey's first Mastermind-induced 'timeshift' hallucination, planting the earliest seed of what would flower into the Dark Phoenix Saga just a few issues later. Simultaneously, a quiet cameo of Magneto reviewing a data file on his late wife Magda — working in concert with a parallel beat in Avengers #186 published the same month — effectively established for the first time that Magneto is the biological father of Quicksilver and the Scarlet Witch, one of the most consequential retcons in Marvel history. The issue thus functions as a crucial narrative crossroads: the Proteus Saga, the corruption of Phoenix, and the Magneto family revelation all begin here.
In "There's Something Awful on Muir Island!", the X-Men are pulled back to the site of their past battles when Moira uncovers a terrifying truth: Proteus has escaped. As Jean grapples with unsettling visions tied to her Phoenix powers, and Mastermind’s illusions begin to blur reality, Beast tracks down the team with urgent news—Moira needs them, and Muir Island is no longer safe. Written by Chris Claremont and brought to life by John Byrne’s dynamic art, with Terry Austin’s inks and Glynis Wein’s colors, this 1979 issue delivers a tense, character-driven mystery. The cover by Dave Cockrum and Terry Austin captures the eerie tension of the island’s secrets.
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The issue was scripted by Chris Claremont from a plot co-developed with penciller John Byrne, inked by Terry Austin, colored by Glynis Wein, lettered by Tom Orzechowski, and edited by Roger Stern, with Jim Salicrup as assistant editor and Jim Shooter as editor-in-chief; the cover was painted by Dave Cockrum and Austin. Byrne confirmed in published interviews collected in Comic Creators on X-Men that the concept of Moira MacTaggert's dangerous hidden son had been gestating since Claremont's earlier work with Dave Cockrum — a 'Mutant X' containment-cell label had appeared as far back as issue #104 — but Claremont held the full story until Byrne joined the title, where the partnership's visual intensity could do justice to a villain who literally warps the laws of physics. The Magneto-Magda beat in this issue was co-engineered by Byrne, who recalled noticing a physical resemblance between Magneto (without his helmet) and Quicksilver, and who — working with Mark Gruenwald and editor Roger Stern — seeded the parentage inference so subtly that it was never intended to be stated outright, even as later writers made the connection overt.
Trivia · 8 facts
- First on-page appearance of Mutant X (Kevin MacTaggert / Proteus), the reality-warping, body-possessing mutant son of Dr. Moira MacTaggert; the character is referred to only as 'Mutant X' in this issue and does not adopt the name Proteus until issue #126.
- Written by Chris Claremont (script) and John Byrne (co-plotter), with interior art by Byrne and Terry Austin; the cover was by Dave Cockrum and Austin — notable because Cockrum was no longer the series interior penciller but continued providing covers.
- Full production credits: colorist Glynis Wein, letterer Tom Orzechowski, editor Roger Stern, assistant editor Jim Salicrup, editor-in-chief Jim Shooter; on-sale date June 19, 1979, with a September 1979 cover date.
- Magneto's cameo — viewing a data file on his late wife Magda — functions, in tandem with Avengers #186 published one month earlier (also drawn by Byrne), as the first implicit reveal that Magneto is the biological father of Quicksilver and the Scarlet Witch; the connection was intentionally left as inference and was not made explicit in either book.
- Jean Grey experiences her first Mastermind-induced 'timeshift' hallucination — seeing herself as an 18th-century noblewoman — initiating the prolonged psychological manipulation plot that leads directly to the Dark Phoenix Saga beginning in issue #129.
- Lilandra Neramani appears here as Empress of the Shi'ar Empire for the first time, marking a status-change from her earlier appearances as a fugitive princess.
- Inker Terry Austin secretly inserted cameo figures of DC's Phantom Stranger and the cartoon character Popeye into a background crowd scene depicting a Shi'ar gathering — a recurring Easter-egg tradition Austin and Byrne employed during this era.
- The four-issue Proteus Saga (issues #125–128) was later collected in the Marvel Premiere Classic hardcover X-Men: Proteus; the arc was also adapted as a two-part episode of the 1990s X-Men: The Animated Series, with Proteus voiced by Stuart Stone.
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Reprints
Reprinted in Spécial Strange #26 (1981), Rampage Monthly #43 (1982), Superaventuras Marvel #20 (1984), X:en #2/1985 (1985), Prosjekt X #3/1985 (1985), Die Gruppe X #7 (1986), Marvel #2 (1986), The Official Marvel Index to the X-Men #7 (1988), Classic X-Men #31 (1989), El Asombroso Hombre Araña Presenta #97 (1990), Essential X-Men #2 (1997), Marvel Special #11 (1997), Marvel Masterworks: The Uncanny X-Men #4 (2004), The Uncanny X-Men Omnibus #1 (2006), X-Men: Proteus #[nn] (2009), Marvel Masterworks: The Uncanny X-Men #4 (2012), Marvel Gold. La Imposible Patrulla-X #2 (2012), X-Men Classic #4 (2012), X-Men: Dark Phoenix Saga Omnibus #[nn] (2018), X-Men: Children of the Atom #[8] (2019), X-Men Epic Collection #6 (2020), Phoenix Omnibus #1 (2021), X-Men - La Collection Mutante #39 (2022), Projekt X #2/1985 + 1 more
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