Gwendolyn "Gwen" Tennyson is a Terran from the planet Terra and a friend of Ben in Ben 10: Alien Planet.


In Alien Planet, Gwen wears a white shirt under a dark blue sweater, black stockings under a black mini skirt, and black high heels. Her hair is worn in a high ponytail and she wears blue-tinted glasses.


Gwen is a quick thinker and an instinctive person. She can handle dangerous situations, despite their often unfavorable conditions. Gwen is at times shown to be very concerned with the well-being of things around her, such as her surroundings, the people around her, and those she cares about. Gwen is a very caring, compassionate person.

Powers and Abilities

Gwen can create energy blasts, shields and barriers. Her powers are mainly used like energy constructs, allowing her to make many different types of structures like, hammers, protective helmets, battering rams, beams to grab and throw enemies, stepping stones/platforms to carry her and others though air, safety nets; it also turns out Gwen can also synchronize her martial arts styles with her energy manipulation abilities. Gwen is also a capable gymnast and martial artist. At the age of fifteen it is revealed that she has already received a black belt in taekwondo.


At times she trusts others too quickly, and that may be a disadvantage or even injure her. Although she is very strong (physically and mentally) and well mannered, she displays inflating sarcasm and ego at certain times.



  • And Then There Were Null


  • Gwen's favorite flowers are yellow roses.
  • Gwen's birthday is in December.
  • ​According to Diagon, Gwen is the most powerful being on Earth.
  • Gwen is Verdona's favorite grandchild.
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