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 .
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
: Ben eventually realizes he is in a dream and gains control over the environment. He deduces that the nightmare is actually a projection of Albedo's fears , not his own . In reality, Albedo had attempted to infect Ben with the Dream Eater but accidentally tripped on a smoothie, causing the parasite to latch onto his own face . Premiering on March 10, 2012, it is the
: 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 In reality, Albedo had attempted to infect Ben
As the episode progresses, Ben finds himself in a surreal nightmare world where:
The episode ends with Albedo trapped in a permanent nightmare of his own making, while Ben and his team wait for Plumber assistance to safely remove the creature .