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Classic X-Men #31 cover
Cover: Steve Lightle

Classic X-Men #31

Mar 1989 · Marvel · 1.25 USD; 1.75 CAD; 0.50 GBP
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In "There's Something Awful on Muir Island," Jean Grey's Phoenix abilities are tested under intense scrutiny, triggering unsettling hallucinations that blur reality. As Moira uncovers the terrifying truth that Proteus has escaped, Beast learns the X-Men are alive and races to warn them—only to find they’re already on their way to Muir Island, drawn by a desperate call for help. Written by Chris Claremont and brought to life with dynamic art by John Byrne, this pivotal issue blends psychological tension with high-stakes mystery, all framed by Steve Lightle’s striking cover.

Contains 2 stories
There's Something Awful on Muir Island
17 pp · Superhero
X-Men [Professor XCyclopsPhoenix [Jean Grey]StormWolverineColossusBansheeNightcrawler]BeastMoira MacTaggertLilandraHavokPolarisMadrox, the Multiple ManProteus (villain)Magneto (villain)Mastermind [Jason Wyngarde] (villain)Iceman (cameo flashback)Angel [Warren Worthington III] (cameo flashback)Magda Lehnsherr (Magneto's wife on video)Popeye (snuck into a group panel of aliens on the Shi'ar homeworld)Phantom Stranger (snuck into a group panel of aliens on the Shi'ar homeworld)

In "There's Something Awful on Muir Island," Jean grapples with the growing instability of her Phoenix powers under Moira’s watch, while eerie hallucinations twist her perception. As Mastermind’s influence spreads, Moira uncovers a terrifying truth: Proteus has escaped, and with the X-Men scattered, Beast must rally them to Muir Island—where Moira’s desperate call for help may be their only chance to stop what’s coming.

Spigot at the End of the Universe
12 pp · Superhero
Professor XLilandraChakra

ComicBooks.com Value

Our Model is In Beta
Raw (VF) $5
CGC 9.8 · 3 in census $68*
CGC 9.6 · 2 in census $31*
CGC 9.4 · 1 in census $30*
CGC 9.2 none in existence
CGC 9.0 none in existence
CGC 8.5 none in existence
Show all 13 grades
CGC 8.0 none in existence
CGC 7.5 none in existence
CGC 7.0 none in existence
CGC 6.5 none in existence
CGC 6.0 none in existence
CGC 5.5 none in existence
CGC 5.0 · 1 in census $30*
* estimate — limited direct-sales data at this grade
Our model’s value — refined as new sales data arrives · CGC census counts shown where available

More listings for this title

Marvel Classic X-Men Issue #31 $3
Related listings we couldn't confirm as this exact issue · 1 total · seen 29 days ago

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Full credits

artist John Byrne
colorist Glynis Oliver
cover pencils, inks Steve Lightle

Reprints

↩ Reprints The X-Men #125 (1979)

Reprinted in El Asombroso Hombre Araña Presenta #97 (1990), X-Men Saga #12 (1993), The Uncanny X-Men Omnibus #1 (2006), X-Men Classic #4 (2012), Phoenix Omnibus #1 (2021)

Key issues in Classic X-Men

Variants (1)

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