omnitrix

The Omnimatrix,[2][3] better known as the Omnitrix, was a watch-like device that attached to Ben Tennyson's wrist at the beginning of the series and is the device that the franchise revolves around. The device is a portable library of intergalactic genetic data that allowed the wielder to alter their DNA at will and transform into a variety of different alien species, each with their own unique abilities.