Fans of Ben 10: Alien Force get ready for an all new season, with "The Vengence of Vilgax" a one-hour season premiere on September 11, 2009, at 8:30pm on Cartoon Network . Source Here

ok guys go here you can watch all season ones from 1-13 , season 2 from 1-13 and season 3 from 1-12 and 13 is gonna be up soon url: i hope u enjoy :)

season 2 ep 12, 13 war of the worlds part 1 and 2 is now up srry for the late upload been busy