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|The characters and/or events depicted in this article pertain to games of the Ben 10 franchise.|
|The characters and/or events depicted in this article are non-canon to the main series' continuity.|
As a Fusion, she must take the form of her host, Gwen Tennyson. The only differences are her Fusion Matter skin, dark green hair, red eyes, dark blue-green shirt and lack of a ponytail.
Fusion Gwen was created by Fuse to assist Fusion Ben in the space port; she also has another fusion location. Given her assignment, Fusion Gwen locates Ben Tennyson and studies the Omnitrix/Ultimatrix Progress Rate and at the right time, she steals an alien DNA sample when Ben transforms into a transformation. However, on her way to deverie the samples, Gwen drops the samples and the Hero's mission is to receive and return the samples before Fusion Gwen returns to retrive them. She then blocks the entrance to Fusion Ben's Lab to convince the Hero that she had the last sample, the Swampfire Root. After the Hero defeats her, they take the sample as it was formed into a Swampfire Nano.