SilenTalent | What Ever Happened To Gwendolyn Tennyson? @Not_My_Policy | Uploaded September 2020 | Updated October 2024, 13 hours ago.
We all know about Kenny Tennyson--Ben's potentially future son. But Ben has two children further in the timeline: Kenny and his sister, Gwendolyn, who has only been seen twice in the franchise. We're aware of two versions of Kenny but what about Gwendolyn? Where's she? In this video I'll explain how the daughter of Ben 10 was sadly lost among the series.

Sources:
ben10.fandom.com/wiki/Gwendolyn_Tennyson_(Ben's_Daughter)

ben10.fandom.com/wiki/Ben_10_Planet?file=Gwen+23+Not+An+Anodite.png

ben10.forumotion.co.uk/t130p750-qa-with-matt-wayne

https://ask.fm/DerrickJWyatt/threads/163590565748