en 10: Ultimate Alien is an American animated television series – the third entry in Cartoon Network's Ben 10 franchise created by team Man of Action, and produced by Cartoon Network Studios.

It was slated to premiere after the series finale of Ben 10: Alien Force on March 26, 2010, but actually premiered on April 23, 2010, in the US and in the UK; and Latin America on October 10, 2010, coincidentally the date was 10/10/10, and at 10 a.m.

In Canada, the series started airing on September 12, 2010, on Teletoon.

The series finale finished on March 31, 2012 with the two-part episode, The Ultimate Enemy, being in memory of Dwayne McDuffie who had died during the production of this series.

Overview from themoviedb.org