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: It is widely considered one of the "darkest" episodes of the franchise due to its psychological horror elements and the tragic nature of Albedo's defeat . Ben & Albedo's Nightmare World ft. O.R.Ash

The Ben 10: Ultimate Alien episode (Season 3, Episode 17) is a psychological thriller that serves as a pivotal character study for the series' recurring antagonist, Albedo . Premiering on March 10, 2012, it is the final episode before the three-part series finale . Plot Summary

The episode begins with Ben Tennyson seemingly waking up in a deserted version of Bellwood . He is immediately attacked by a , a parasitic creature that latches onto its victim's face to induce a coma-like sleep while feeding on their stress hormones .

This episode is noted as a "bottle episode," featuring only the primary voice cast and using existing character models . Voice Actor Ben Tennyson, Albedo Ashley Johnson Gwen Tennyson Greg Cipes Kevin Levin Dee Bradley Baker Various Aliens (Swampfire, Four Arms, Big Chill, NRG, etc.) Production Details Network : Cartoon Network . Director : Dan Riba . Writer : Don McGregor (credited alongside Man of Action) .