Jean Grey-Summers is a very powerful mutant that trained under Charles Xavier, originally as Marvel Girl, but after a devastating plane crash, she was killed. She revived herself using powers that she didn't even know that she had. This extreme output of power caused a dark entity known as the Phoenix to enter her body. She is usually able to supress the Phoenix, but eventually, the Phoenix goes crazy, causing Jean Grey to turn into the Dark Phoenix. As the Phoenix and the Dark Phoenix, she can fly, use telekinesis, and create fire out of thin air. As one of the more dangerous and powerful characters, enemies fear her more than anyone else. Later she became the Black Queen.
The Millennia: The Newest Female Superhero