This article is about Ben 10,000, the character. You might have been looking for the episode of the same name.
Ben 10,000 is the fully grown "future" version of the main timeline Ben Tennyson, who has become a full-time superhero. He appears throughout the shows in some time-travel episodes. There are three versions of him, one who appeared in the original series, one who appeared in Ultimate Alien and one who appeared in Omniverse. All three are equally canon as other many possible alternate futures of Ben.