The X-Men have to fight off an invader in X-Mansion who has been sent to test their abilities.
The on-sale date is the publication date given in the U. S. Copyright Office filing.
- - Inside front cover. Ad for various novelty items.
- The "X"-Sanction! - Fill-in originally planned to be published in X-Men #109, as explained by Claremont in the letters page. Last page shows Wolverine wearing gauntlets out of which his claws pop (they were originally intended to be part of his costume and not implanted in his skin).
- - One letter of comment, from reader Richard Roder.
- - Includes Stan's Soapbox.
- Spider-Man Spoils a Snatch - Ad for Hostess Cup Cakes.
- - Ad for a bodybuilding program.
- A Galaxy of Star Wars Treasures! - Inside back cover. Ad for Star Wars merchandise.
- - Back cover.