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Official Site: Marvel

Ellie Phimister (Known as: Negasonic Teenage Warhead) is a fictional character appearing in American comic book published by Marvel Comics. The character was created by Grant Morrison and Frank Quitely, and named after the song "Negasonic Teenage Warhead" by Monster Magnet. The character is a mutant who displays telepathic and precognitive powers, and is a student of Emma Frost.

The character appears in the 2016 film Deadpool and its 2018 sequel Deadpool 2, albeit with a different look and superpowers to high-impact kinetic charges, much like New Mutants/X-Men member Cannonball. This was done through a deal between 20th Century Fox and Marvel Studios, which allowed Marvel Studios to use Ego the Living Planet in the 2017 film Guardians of the Galaxy Vol. 2 in exchange for changing the character's powers. In Deadpool and Deadpool 2, Negasonic Teenage Warhead is a member of the X-Men, portrayed by actress Brianna Hildebrand; she is the first LGBT character to star in a superhero film that openly features a same-sex couple. Due to the positive reception, the character's appearance and powers were eventually altered in the comics to match her appearance in the Deadpool films, followed by this new version appearing in a number of Marvel-themed mobile games, such as Marvel Future Fight and Marvel Strike Force.

Negasonic Teenage Warhead first appeared in New X-Men #115 (2001), written by Grant Morrison and illustrated by Frank Quitely.

Ellie Phimister was a Genosha teenager, with pale skin and dark hair, who dressed as a goth and was a student of Emma Frost's telepathy class. During a tutoring session, Ellie reported having a recurring nightmare fifty times the previous night wherein all people in Genosha were exterminated. She then pointed out that she had experienced the same vision during the class. Almost simultaneously, Cassandra Nova's Wild Sentinels appear on Genosha and wipe out half the world's mutant population: sixteen million people.

Negasonic Teenage Warhead has not been a contender in any CBUB matches.