Most people who are born with the X-gene do not know it until they hit puberty. Unfortunately, Marigold's X-gene presented from the moment she was born. All she has known her whole life were the white walls that surround her. No one knew of her existence, until someone made a call to Professor Xavier and his X-Men team. ( First chapter takes place between episodes 2 and 3 of season 1. So Kitty is already apart of the X-men, but this is before Rouge shows up.)

A group of people with extraordinary powers use them to fight those who have powers like them, but use those powers for evil. The powers are a result of a mutation in their DNA and this group is known as the X-Men. They live among those, hidden in plain sight, who are human.