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She looks exactly the same as the main timeline Gwen at age of 10 except she has the Omnitrix.
In Gwen 10, the episode took place at the beginning of summer, much to Ben's surprise when he found out that he didn't have the Omnitrix and had somehow travelled back in time. At the camp site where Ben had originally found the Omnitrix, he was shocked to find that Gwen had reached the crash site first and the Omnitrix had latched on to her wrist. He is visibly annoyed, but attempts to teach Gwen, but realizes that she had greater control over the aliens that he had at first. Gwen turned into Heatblast and was able to blast her name into the sky with flames, which Ben admitted took him a month to learn. Ben later turned her into Grey Matter and messed with her. She fought one of Vilgax's Drones as Diamondhead and defeated it just as Ben had, but used her knowledge of refraction to fight more effectively. She brought Ben to a bowling alley and played as Four Arms, scoring four strikes in four different lanes.
She was then captured by Vilgax and the Omnitrix was removed from her and attached itself to Grandpa Max.
- Gwen 10 (first appearance)
- Gwen was much better with the Omnitrix because of her patience - something Ben has very little of.