Omnitrix

The Omnimatrix (often referred to as the Omnitrix) is a watch-like device that attached to Gwen's wrist around 5 years prior to the first episode.

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.

The Omnitrix has a two-fold purpose:
 * It can promote inter-species understanding by allowing other beings to experience different ways of life.
 * It can 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 become extinct and bring them back.
 * 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.

Background
In the first form that Gwen encountered, the Omnitrix looked like a very big wristwatch, primarily with two shades of blue in color, with the dial the same dark blue as the rest, in the middle (like a watch face) which has a pink hourglass shape (one of the intergalactic "peace" symbols, also on Plumber's badges and Galvan Prime) on it. This symbol design, however, was a scratch guard, which fell off sometime around when Gwen was 11. When Gwen selects her aliens it shows the alien's silhouette.

When it recalibrated, the Omnitrix gained a more watch-like shape, a blue wristband, became smaller and sleeker, and the face dial became black and pink. The inside of the hourglass shape glowed in different colors at certain moments. These colors signify the mode that the Omnitrix was presently in. When Gwen is selecting her aliens it rather shows the alien's hologram standing on the core rather than the alien's silhouette.