Cartoon Network does not make episodes of the television show "Ben 10: Omniverse" available by free download. Episodes and full seasons can be purchased and then streamed through sites like Amazon.
"Ben 10: Omniverse" is a cartoon starring superhero Ben Tennyson, his sidekick Rook and their unlikely band of friends and enemies. The cartoon began airing in 2012. It is part of a greater franchise of Ben 10 shows and games that also include "Ben 10: Aliens and Ultimate Aliens."
The Ben 10 show is in its eighth season, as of April 2015. There are free clips from the show on the Cartoon Network website, as well as dozens of free Ben 10 games to play online.