The Omnimatrix, better known as the Omnitrix, was a watch-like device that attached to Ben Tennyson's wrist in the first episode of the series, and is one of the devices that the franchise revolves around. The device allowed whoever wore it to alter their DNA at will, and transform into dozens of different alien species, each with their own unique abilities.

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 had a three-fold purpose:

  • It would promote inter-species understanding by allowing other beings to experience different ways of life.
  • 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 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.

The Omnitrix was destroyed in The Final Battle: Part 2.