A festive season is threatened when a rogue Ultron robot, believing itself to be Santa Claus, begins a holiday rampage across the Marvel Universe. The heroes of Marvel, including Spider-Man, the Fantastic Four, the New Avengers, and the X-Men, must put aside their differences and their own holiday plans to confront this unusual threat. They must navigate the chaos caused by the robot's misguided attempts at gift-giving and festive cheer, which manifest as dangerous disruptions, to save the holiday for everyone.

This collection brings together a variety of holiday-themed tales from across the Marvel Comics universe. The anthology format allows for diverse storytelling styles and character focus, from action-packed superheroics to more character-driven narratives. The premise of an Ultron robot believing itself to be Santa Claus suggests a blend of humor and high-stakes action, typical of Marvel's more lighthearted holiday specials. The inclusion of multiple popular teams indicates a broad appeal for fans of the Marvel continuity.