Very little girl Jean Gray was left without parents. The only one who sheltered her is Charles Xavier, who has a special school for gifted children. He always knew that Jin was an exceptional girl, almost the most powerful mutant on our planet. During a single rescue operation on Earth’s orbit, Gene almost died due to an incomprehensible cosmic power, but she was able to survive. When the mutant team returned home, she saw how Jin's strength began to grow. And the further - the harder it was for them to control them. It even goes so far that the girl will harm those whom she loves the most. Her forces will become uncontrolled - and then the X-Men will have to make a choice: save a member of their team or all of humanity.