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And you are?"
"Negasonic Teenage Warhead."
"Negasonic Teenage... What the sh*t?! That's the coolest name ever!
~ Deadpool and Negasonic

Ellie Phimister, also known as Negasonic Teenage Warhead, is a supporting protagonist in the film Deadpool and it's sequel Deadpool 2. She is a mutant who can detonate atomic bursts from her body.

She is portrayed by Brianna Hildebrand.



After spotting Deadpool on the news, Colossus took Negasonic with him in an attempt to convince the mercenary into joining the X-Men. However, Deadpool declined and ended up fleeing from the mutants. Later, the mercenary would enlist the two mutants' help in saving Vanessa Carlysle and defeating Ajax. During the fight, Negasonic Teenage Warhead used her powers to take out multiple soldiers and save Colossus from getting strangled by Angel Dust. At the battle's conclusion, Negasonic Teenage Warhead, left the area with Colossus as Deadpool reunited with Vanessa.

Deadpool 2

Negasonic Teenage Warhead was at the X-Mansion with fellow X-Man and girlfriend Yukio when Colossus brought Deadpool there to recover after the latter tried to suicide. When Colossus convinced Deadpool to join the X-Men, she joined them on a mission to stop a mutant causing trouble at the Essex House for Mutant Rehabilitation. During the mission, Deadpool managed to talk to Russell, then proceeded to kill some of the orphanage's staff when he learned that they were abusing Russell. Deadpool was subsequently arrested.

Colossus, Negasonic and Yukio later travelled to the Essex House to back up Deadpool, Cable, and Domino in taking on the Juggernaut. Negasonic and Yukio helped to evacuate the children from the orphanage, then assisted Colossus in defeating Juggernaut.

Sometime after, Negasonic and Yukio repaired Cable's time travel device and gave it to Deadpool, allowing him to travel though time to save Vanessa Carlysle and Peter. He also used it to kill an earlier incarnation of himself and Ryan Reynolds before he made Green Lantern. However, they both realize that they have made a terrible mistake.


Negasonic is portrayed as a antisocial, calm, snarky, sarcastic, unmotivated, yet good humored and patient teenager, her outrageous mutant name is a good indicator of how little she cares about what anybody thinks of her. Whilst Deadpool seems to expect her to be a stereotypically angst teenager, which she does not deny, she is shown to possess a genuine heroic personality.

Negasonic can also be somewhat rude, as she isn't afraid to insult people whom she doesn't like, such as calling Deadpool "Douchepool" when she tried to tell him that Ajax got away, and old due to him referencing Alien 3. She would even take a moment to write a Twitter post on her phone right at the start of a battle. Despite being somewhat moody at first, Negasonic is entertained by Deadpool's feeble attempts to hurt Colossus, giggling as he fails to do so. She does eventually warm up to Deadpool, calling him "cool" after they defeated Ajax and successfully saved Vanessa Carlysle. Negasonic can also be very decisive in combat, not hesitating to attack Angel Dust, providing Deadpool with the means to reach Ajax, and saving Colossus in time.

Negasonic also possess a close relationship with her mentor, Colossus. Whilst she seems to dislike his gentle and serious nature, Negasonic does not undermine or argue against him. A further testament of their close relationship, is that Negasonic almost risks herself to save Colossus as she renders herself unconscious using all her power to save him, despite the risk of collateral damage killing her.

Powers and Abilities

  • Explosion Creation & Manipulation: Negasonic is capable of generating explosions from her body of varying degrees. She can create a strong enough blast to push a van sideways with enough force to crush a human or a blast capable of toppling a grounded hellicarrier, as well as create a downward explosion capable of launching herself high into the air. She can even use her explosions in conjunction with a full body charge to attack superhumanly strong opponents like Angel Dust. Nega-Sonic does seem to require a certain amount of concentration and 'charging' time in order to better control the size/shape/direction of her explosions. Momentum also appears to play some part in the overall force and general direction of her explosions.


  • Due to the popularity of her character in the movie, Negasonic Teenage Warhead has been revived in the comics. Her appearance now matches her film counterpart.
  • Ellie can be seen wearing an 'X-Men' uniform similar to the one from X-Men: First Class.
  • In the comics, Negasonic is a telepath and precognitive mutant. However, her abilities were changed for the film due to the fact that the writers thought that by having explosive powers, it would fit more with her name.


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X-Men: Wolverine | Professor X | Jean Grey | Cyclops | Storm | Shadowcat | Nightcrawler | Iceman | Beast | Colossus | Magneto | Mystique | Archangel‡ | Havok† | Banshee† | Darwin† | Quicksilver | Bishop | Blink | Sunspot | Warpath | Negasonic Teenage Warhead | Rogue | Selene Gallio
Non X-Men Mutants: Jubilee | Kayla Silverfox | Gambit | Deadpool | Emma Silverfox | Yukio | Caliban† | X-23 | Wolfsbane | Magik | Cannonball | Mirage | Lockheed
X-Force: Deadpool | Cable | Domino | Peter | Bedlam | Shatterstar | Zeitgeist | Vanisher | Firefist
Humans: Moira MacTaggert | Kenuichio Harada | Mariko Yashida | Vanessa Carysle | Dopinder | Weasel | Blind Al | Peter

X-Men (1992): To be added
X-Men: Evolution: To be added
Wolverine and the X-Men: To be added
Marvel Anime: X-Men: To be added
Legion: To be added
The Gifted: To be added

See Also
X-Men Movie Heroes