Dark Phoenix by Toy Biz

Jean Grey is probably the first comic book superheroine to turn to the dark side, a la Anakin turning into Darth Vader. Jean Grey is consumed by the Phoenix Force when she sacrifices herself to save her team mates, re-emerging as Phoenix. Later, after being corrupted and manipulated by Mastermind and unable to adapt to her enormous power, Jean was driven mad and became Dark Phoenix, destroying a planet populated by sentient creatures by eating the sun of that planet's solar system to satisfy her "hunger" and subsequently died committing suicide on Earth's moon.

In "X2: X-Men United", Jean is engulfed in a fiery aura as she held back a tsunami of water from a burst dam to save her team mates and a giant flying fiery bird can be seen reflected in the water in the final scene. In the third X-Men movie, "X-Men: The Last Stand", Jean becomes Dark Phoenix, kills Scott/Cyclops, kills Professor Xavier and joins Magneto. Wolverine manages to stop Dark Phoenix from wrecking havoc and total chaos and end the destruction. Jean is buried on the X-Mansion ground, beside Scott and Prof X.

With hair like that, no wonder Jean turned to Dark Phoenix