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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, Gwen found the Omnitrix and turned into Heatblast. Ben later turned her into Grey Matter and messed with her. She fought one of Vilgax's Drones as Diamondhead. She brought Ben to a bowling alley and played as Four Arms.
She was 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.