Mr. Mertens is the father of Finn Mertens (Farmworld Finn) and husband of Mrs. Mertens. He appeared in the episodes "Finn The Human" and "Jake The Dog." He is often bullied by Big Destiny and his gang. He was forced to give up the family donkey, Bartram. Gallery Add a photo to this gallery Retrieved from "https://adventuretimesuperfans.fandom.com/wiki/Mr._Mertens?oldid=31797" Categories: Character Minor Character Male Human Community content is available under CC-BY-SA unless otherwise noted.