What is Omnitrix?

The Omnitrix is the mysterious watch-like alien device that allows the user to transform into various alien forms by combining the DNA of the selected alien with the user's own DNA, effectively turning them into the alien species the user has selected.

Heroes and villains with Omnitrix

Ben 10 Benjamin Kirby Tennyson
Ben 10
Eru Iluvatar Eru
Eru Iluvatar