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|The characters and/or events depicted in this article are non-canon to the main series' continuity.|
|The characters and/or events in the storyline depicted in this article have been removed from the main continuity.|
|Relatives|| Max Tennyson (great-grandfather)|
Wes Green (great-grandfather)
Carl Tennyson (grandfather)
Sandra Tennyson (grandmother)
Ben 10,000 (father)
Kai Green (mother)
Ken Tennyson (brother)
Devlin Levin (adopted)
Gwendolyn Tennyson (aunt)
Natalie Tennyson (great-aunt)
|First Appearance||Ben 10,000|
In Ben 10,000, Gwendolyn appeared during the battle between Vilgax, the 10-year old Ben, and Ben 10,000. The reason for this is unknown as Ken 10 is set 12 years after the episode Ben 10,000 so she would not have been born or would have been a baby.
In Ken 10, Gwendolyn was seen at Ken's 10th birthday party.
- According to Dwayne McDuffie, Gwendolyn and her brother were named after Ben's cousins, Gwen and Ken.
- According to Derrick J. Wyatt, Ben 10,000 does not have Gwendolyn as his daughter in Omniverse.