Willow Smith is fulfilling a lifelong dream. The 17-year-old singer-actress will guest star on the series finale of Cartoon Network's Adventure Time, airing Sept. 3, ET has exclusively learned. Smith, ...

Cartoon Network will air two episodes of "Elements" a night, April 24 - 27. Cartoon Network has announced the third installment in its “Adventure Time” franchise. Titled “Elements,” the four-night ...