Question: What is the birth name of the character originally voiced by Zack Shada who helps rescue Princess Bubblegum in "Adventure Time"?
Sentence (from "Adventure Time (pilot)"): The short follows the adventures of Pen (voiced by Zack Shada), a human boy, and his best friend Jake (voiced by John DiMaggio), a dog with magical powers to change shape and grow and shrink at will.
Relevant evidence: No