Jean Grey is a class five mutant which means that she is the most powerful of them all. She was born with telepathic and telekinetic powers. Her powers are so strong that she is not able to control them so that is where Professor X comes in and helps Jean control her powers so she can have a normal life. Jean Grey is a character which is really popular in the X-Men, Cyclops is her husband, Charles Xavier being her father figure, and Wolverine being her love interest, her best friend and in a way sister like figure is Storm.
Things take a wrong turn when she loses a hold on her powers and turns into a dark Phoenix, no one can stand in her way when she kills Professor X but one man Wolverine who is able to get close enough to her thanks to his healing powers and is able to put her down.