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In Back with a Vengeance, the Omnitrix was attempted to be removed by Kevin Levin. In And Then There Were 10, Ben found the Omnitrix and it put itself on his wrist. Secretly, Azmuth had another reason for creating the Omnitrix: he hoped that his estranged lover Zennith, who had left him as he created Ascalon, would learn of his change and come back to him.It would serve as a repository for the DNA of over a million different intelligent species, preserving them in the event that any of them should ever be rendered extinct and restore them to life.It would promote inter-species understanding by allowing other beings to experience different ways of life.The Omnitrix was created by Azmuth as a tool of peace in an act of repentance following the destruction caused by his previous creation, Ascalon, a weapon of terrible power. When Ben is selecting his aliens it shows the alien's hologram standing on the core rather than the alien's silhouette. These colours signify the mode that the Omnitrix was presently in. The inside of the hourglass shape glowed in different colours at certain moments. When it recalibrated, the Omnitrix gained a more watch-like shape, a green wristband, became smaller and sleeker, and the face dial became black and green. However, whenever Ben transforms into an alien form, the colors of the Omnitrix symbol that is located on the alien form have been changed from white and grey to green and black, due to the removal of the scratchguard. The prototype Omnitrix (before recalibration) in Omniverse looks the same as how it was in the Original Series.
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When Ben selects his aliens it shows the alien's silhouette. In the first form that Ben encountered, the Omnitrix looked like a very big wristwatch, primarily black and grey in color, with a grey (or black) dial in the middle (like a watch face) which has a green hourglass shape (the intergalactic "peace" symbol, also on Plumber's Badges and Galvan Prime) on it.