Cast of Ben 10: Ultimate Alien

Yuri Lowenthal lends his voice to the character of Ben Tennyson in Ben 10: Ultimate Alien. Ben Tennyson is the main protagonist of the series and a young boy who acquires a powerful device called the Omnitrix, enabling him to transform into various alien forms. Lowenthal's portrayal of Ben captures the adventurous and heroic nature of the character.

Ashley Johnson provides the voice for Gwen Tennyson in Ben 10: Ultimate Alien. Gwen is Ben's cousin and a skilled magician. Johnson's voice work brings out Gwen's intelligence, determination, and resourcefulness as she battles alongside Ben to protect Earth from various threats.

Greg Cipes brings Kevin Levin to life through his voice acting in Ben 10: Ultimate Alien. Kevin is a former antagonist turned ally of Ben Tennyson. With the ability to absorb and manipulate various materials, Kevin assists Ben in their battles against villains. Cipes' portrayal captures Kevin's edginess and complex character development throughout the series.

Dee Bradley Baker provides the voice for Humungousaur in Ben 10: Ultimate Alien. Humungousaur is one of Ben's powerful alien forms, possessing incredible strength and size. Baker's vocal talents bring out the raw power and primal nature of Humungousaur, making him a formidable ally in Ben's missions.

Chris Pratt voices the character of Cooper in Ben 10: Ultimate Alien. Cooper is a techno-geek who often assists Ben with his tech skills and inventions. Pratt's voice work highlights Cooper's intelligence and enthusiasm for technology, adding an extra layer of support to Ben and the team.

Powers Boothe lends his voice to the character of Sunder in Ben 10: Ultimate Alien. Sunder is a ruthless mercenary and antagonist in the series. Boothe's powerful voice adds gravitas and intensity to the character, making Sunder a formidable opponent for Ben and his allies.

Peter Stormare provides the voices for both King Xarion and King Viktor in Ben 10: Ultimate Alien. King Xarion and King Viktor are leaders from the planet ZarAuth who play significant roles in the series. Stormare's versatile voice talents bring out the regality and authority of both characters, showcasing their importance in the intergalactic conflicts within the show.

Beth Littleford provides the voice for Sandra Tennyson in Ben 10: Ultimate Alien. Sandra is Ben and Gwen's caring and supportive mother. Littleford's voice work brings warmth and love to the character, emphasizing Sandra's role as the anchor for the Tennyson family.