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"Ben 10: Ultimate Alien" is the fourth installment in the Ben 10 franchise, following "Ben 10," "Ben 10: Alien Force," and "Ben 10: Race Against Time." It was produced by Cartoon Network Studios and aired from April 23, 2010, to March 31, 2012. The series follows the adventures of Ben Tennyson, a teenager who can transform into various alien forms using the Omnitrix, a device that attaches to his wrist.

In "Ben 10: Ultimate Alien," Ben has reached a new level of maturity and responsibility. The Omnitrix has evolved into the Ultimatrix, which allows Ben to access new alien forms and even evolve his existing aliens into more powerful versions known as "ultimate forms." This new power comes with significant challenges as Ben must now deal with enemies that are more formidable than ever before.

The series introduces several new characters and aliens, including Ben's ultimate forms, such as Ultimate Swampfire, Ultimate Spidermonkey, and Ultimate Humungousaur. It also explores the relationships between Ben and his family, friends, and allies, including Gwen Tennyson, Kevin Levin, and Grandpa Max.

"Ben 10: Ultimate Alien" is known for its action-packed episodes, engaging storylines, and character development. It continues the tradition of the Ben 10 franchise, blending elements of sci-fi, action, and comedy to appeal to a wide audience. The series has been well-received by fans and critics alike, and it has spawned various merchandise, including toys, video games, and comic books.