Question: Finn (also known as Finn the Human and born as Finn Mertens) is a fictional character and the main protagonist of which American animated television series on the Cartoon Network, and an animated short created by Pendleton Ward? 
Sentence (from "Finn the Human"): The character made his debut in the original pilot, where he was named Pen and voiced by Zack Shada, Jeremy's older brother.
Relevant evidence: No