Marvel may have some of the most popular characters in comic book history, but where the brand has really shone is with its teams. One of the first that comes to mind is Marvel’s First Family, aka The Fantastic Four, who have headlined several feature films and hundreds of comics over the years. The Avengers have also become one of Marvel’s biggest cash cows in recent years, particularly thanks to the rise of the team during the early days of the MCU’s Infinity Saga. There is, however, another Marvel team that stands above the rest as the most popular in comic book history: The X-Men.