Ben 10 Ultimate Alien - 2010 Prisoner 775 Is Missing 2-12 was released on:
USA: 29 April 2011
This is true: Yes his very first appearance is in episode 32:Prisoner#775 is missing in Ultimate alien series of Ben 10
Ben 10 Ultimate Alien - 2010 Ultimate Aggregor 1-10 was released on: USA: 10 October 2010
even we do not know.
THE best alien of ben-10 ultimate alien is alien x.
it is not known if there is an ultimate alien yet.
Sneak Previews - 1975 Alien The Prisoner of Zenda The Promise 3-16 was released on: USA: 9 June 1979
Ben 10 Ultimate Alien - 2010 Moonstruck 2-11 was released on: USA: 22 April 2011
Ben 10 Ultimate Alien Cosmic Destruction - 2010 VG was released on: USA: 5 October 2010
Ben 10 Ultimate Alien - 2010 The Purge 2-13 was released on: USA: 16 September 2011
Ben 10 Ultimate Alien - 2010 Perplexahedron 1-15 was released on: USA: 5 November 2010
Ben 10 Ultimate Alien - 2010 The Creature from Beyond 2-7 was released on: USA: 2011
its either Ultimate Humoungousaur or Ultimate XLR8. EDIT BY UNDEADAWE: XLR8 cant go ultimate, lol. Anyways, Ultimate Ben is the best, fact, not opinion.