Issue No. 30 of the Marvel comic book X-Men Gold, which will hit stores on Wednesday, will feature a wedding, but not the one fans were expecting.

In January, Kitty Pryde, the leader of this group of X-Men, proposed to her teammate, Piotr (“Peter”) Rasputin, and the current story line, “Til Death Do Us Part,” has been marching toward their big day. But in Wednesday’s issue — spoilers ahead — after a tough heart-to-heart talk with her best friend, who is also the groom’s sister, the would-be bride gets cold feet. The issue is written by Marc Guggenheim and drawn by David Marquez. The pivotal moment is beautifully captured and gut wrenching.

“My stress level went way down,” Mr. Guggenheim said, “once we secured David Marquez to draw this issue. So many of the key moments turn on the acting — the ability for the artist drawing it to convey very subtle emotions. This issue would not work without David’s art.”