The holidays have brought together all the X-Files agents for the very first time! Walter Skinner hosts a get-together for his most special agents, but the festive night turns tense when someone—or something—comes down the chimney! In a second story, the X-Files team of the 1940s—Bing Ellington and Millie Ohio from the Year Zero miniseries—investigate a potential Communist saboteur, but discover an impossible creature—a gremlin!