The lore so far:
Many years ago, the galactic community was destroyed by a mysterious device known as the Omnitrix, reducing all species to pre space civilizations.
Vilgax, the sole survivor of the event swore to hunt down the omnitrix to prevent another calamity.
Only now are the various people of the galaxy starting to rebuild the bridges between them, but the Omnitrix has resurfaced on the wrist of a boy named Ben