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 "Adventure Time (pilot)"): In this episode, Pen and Jake have to rescue Princess Bubblegum (voiced by Paige Moss) from the antagonistic Ice King (voiced by John Kassir).
Relevant evidence: No