Finn Mertens, better known as Finn the Human, is a character and one of the two protagonists in the American animated television series Adventure Time and resulting franchise created by Pendleton Ward. He also appeared in the spin-off series Adventure Time: Distant Lands and Adventure Time: Fionna and Cake. He was voiced by Jeremy Shada in most appearances. The character made his debut in the original pilot, where he is named Pen and voiced by Zack Shada, Jeremy's older brother. Jonathan Frakes voices Finn as an adult in some appearances.