Ultimate Weapon

Ultimate Weapon is the twenty-first episode of the American animated television series Ben 10, which first aired on July 6, 2006.

Trivia

• The aliens used in this episode are Grey Matter, Stinkfly and Fourarms.
• Grey Matter's transformation sequence is shown for the first time.
• Enoch and The Organisation (From "A Small Problem")return, now calling themselves "The Forever Knights"