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Gwen Tennyson is the paternal cousin of Ben Tennyson.


Regular Appearances

Gwen is a girl with short red hair, green eyes, and fair skin. She is commonly shown wearing a white shirt under a blue t-shirt with a black cat face on top, light brown shorts, and blue and white striped socks. She has blue and white converse-like shoes. She also wears a blue hairclip to pin her hair to the left side of her face.

Occasional Appearances

During water-based activities, she wears a one-piece swimsuit and a pair of flip-flops the same shade of blue as her shirt.

In Brief Career of Lucky Girl, she wore a Lucky Girl outfit.

While riding on Rustbuggy, she wore a blue helmet.

In Dreamtime, she wore pink pajama pants underneath her normal shirt(s).

In Welcome to Zombozo-Zone!, she wore a light blue princess gown with a darker blue bow on the front, a matching hat, puffy sleeves and blue flats.

In Beach Heads, she wore light-blue and white swimming shirt, blue swimsuit underneath, and a pair of blue flip-flops.

In Which Watch, she wore a blue spacesuit.

In Introducing Kevin 11, she wore a grey shirt, yellow apron, and yellow and grey socks.

In Big Ben 10, she wore a deerstalker and a coat over her ordinary clothes, as a homage to Sherlock Holmes.

In LaGrange Muraille, she wore a yellow hat.

In Cirque-Us, she wore a light-blue gown with blue ribbon belt.

In Wheels of Fortune, she wore an orange vest, reading glasses with a pink frame, retro 3D glasses over her forehead, and a navy blue cat pin (obtained later in the episode).


Gwen is a remarkably smart and quick-witted girl who is the mastermind behind nearly all of her cousin's plans of defeating villains. She plays an active role as the brains of Team Tennyson. She is also wise beyond her years and often gives Ben advice.

Although she and Ben have many disagreements, Gwen often finds a way to get along with him. She is respectful and friendly towards people in general, but she is not afraid to make sarcastic comments towards whom she is arguing or disagreeing with.

Gwen is quite forgiving, considering she more worried than angry at Ben for running away.[1]

Gwen can be a bit tomboy-ish because of how she acts and speaks sometimes. Even though she is usually confident about herself, she still has insecurities about not being useful to Team Tennyson.[2]

Gwen has an adoration towards science, things from the 80s and 90s eras, space, and geek culture.



Ben Tennyson

Max Tennyson


Ryan Sez



Michael Morningstar


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During the series

In Waterfilter, Gwen tries to become Ben's filter, although Ben hardly listened to her,

Powers and Abilities

She is still a very athletic kid, however: she was the only one to finish the obstacle course in "Rath of Con", even though the other contestants were all adults. She also picked up some Capoeira moves, making her able to keep up with Humungousaur.

She is prone to succeed when trying new things, often picking up new hobbies each episode.

Gwen is slightly more durable than an average human.[2]

Gwen is remarkably good with technology.

Gwen has recently learned a new martial arts branch.[3]


Cat Pin: Gwen used a suit that was given to her by Phil[4], though it was later destroyed by Forever Knight.[1]

Hammer (piruette): She uses a big blue hammer.

Lucky Girl disguise, only shown in Brief Career of Lucky Girl until the third season.


Even though she's slightly more durable than an average person, she still has limited agility, strength, and thinking.

She was afraid of Snakes until King Koil.


Ben 10


  • Gwen is 7 seconds older than Ben.[5]
  • She is notably nicer to Ben than her classic continuity counterpart was in the original series.
  • Unlike the original series, she is totally clueless about Kevin's precocious crush on her. Even when Ben repeatedly talks about it, she seems more annoyed and dismisses it as one of his bad jokes.
  • Unlike Gwen Tennyson in the Classic Continuity, Gwen in the reboot continuity doesn't develop or learn of any magic powers.[DR 1]


Crew Statements

Duncan Rouleau

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