– Aggregor successfully recaptures all five Andromeda aliens. Despite Ben using his Ultimate forms, Aggregor absorbs their powers and becomes unstoppable.
Recommended episode structure (key episodes to watch; spoilers minimized)
The series is typically categorized into three main production seasons, though broadcasting orders sometimes varied. : 20 episodes Season 2 : 12 episodes Season 3 : 20 episodes
Ben's identity leak puts his family in danger. Classic villains like Zombozo, Charmcaster, and Vulkanus team up to target Ben’s mother. Episode 4: "Video Games" ben 10: ultimate alien all episodes
– Kevin begins hunting down old enemies and allies to absorb their energy. Ben decides that Kevin is too dangerous and must be permanently eliminated.
– The Forever Knights wage a massive campaign to forcefully deport all aliens living secretly on Earth.
The Forever Knights wage a unified war against all aliens living on Earth. Ben threatens the Knights with his Ultimate forms to force a truce. Season 3: The Dagon War (Episodes 33–52) : 20 episodes Season 2 : 12 episodes
Joined by Gwen Tennyson and Kevin Levin, Ben faces a new, mysterious threat: . Ben 10: Ultimate Alien Season 1 (2010)
Gains improved agility and strength [2]. How to Watch All Episodes
– Professor Paradox warns Ben about the final map piece, hidden inside a massive, shifting tesseract maze created by the Azmuth. Ben decides that Kevin is too dangerous and
– The barrier breaks down, and the Dagon begins brainwashing the global population.
: Dagon eventually breaks free and possesses the minds of people across Earth. George is killed in battle, and Ben’s nemesis, Vilgax , manage to absorb Dagon's energy for himself.