Question: What was Peter Browngradt's best known  animated television series based on?
Sentence (from "Peter Browngardt"): Peter "Pete" Browngardt (born August 12, 1979 in Sag Harbor, New York) is an American animator, writer, voice actor, and producer, who is best known for being the creator of Cartoon Network's "Uncle Grandpa", in which he also voices the title character, and its early spin-off "Secret Mountain Fort Awesome".
Relevant evidence: Yes