The Alien Force

After the Omnitrix recalibrated for the very first time, Ben lost access to all of his transformations, but he got 10 new ones. Over time, Ben unlocked new aliens and even unlocked some of the originals. The Omnitrix put every alien into a playlist of 10. Every alien that Ben had before the Original Omnitrix was destroyed was known as "The Alien Force".

Trivia

 * Nanomech was a creation of the Omnitrix, and is one of a kind
 * Diamondhead was unlocked by Chromastone's destruction
 * Playlist 3 was incomplete