Gwen Tennyson (Gwen 10)

This is an alternate what if version of Gwen Tennyson that found the Omnitrix instead of Ben.

Appearance
She looks exactly the same as the main timeline Gwen at age of 10 except she has the Omnitrix.

Ben 10
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.

Ultimate Alien
In Ben 10,000 Returns, Professor Paradox referenced a version of Gwen as one of the alternate realities that exist while explaining how cross-time works to Ben, Gwen, and Kevin.

Ben 10

 * Gwen 10 (first appearance)

On-screen

 * Heatblast
 * Grey Matter
 * Four Arms
 * Diamondhead

Off-screen

 * Upgrade
 * Ripjaws
 * XLR8