* Initial Powers: Jean's telekinetic powers are slowly developing throughout the series, and she struggles to control them.
* Phoenix Force: Jean is later revealed to be the host of the Phoenix Force, an incredibly powerful cosmic entity. This grants her immense power, but also makes her unstable and prone to fits of rage.
* "Death" in "The Gift": In the episode "The Gift," Jean seemingly sacrifices herself to save the X-Men from a rogue Sentinel. She seemingly dies in the explosion, leaving a powerful psychic imprint on Scott Summers (Cyclops).
* "Phoenix" Ending: The ending of the series suggests Jean's spirit is still alive, and she may have been reborn as the Phoenix.
* Later Comic Book Appearances: Jean's fate in "Evolution" was never definitively resolved, and she later appeared in the comic books, alive and well, despite her seeming death in the series.
So, while Jean's fate is ambiguous in the show, it's safe to say she did not truly die and ultimately survived, both in the show and in the larger X-Men universe.