Mountain Man appears in “Memories of Boom Boom Mountain”. Finn hears a crying sound so he climbs up the mountain, and discovers that the mountain is really Mountain Man. Mountain Man says that he hates to see the marauders rough-house so Finn comes up with the idea of punching each other with animals, but the Mountain Man seems to be serious about animal care, so the marauders decide to pet each other. When they got rash, many creatures pestered Finn with their problems. Eventually, a cloud comes up so Mountain Man doesn’t have to see people rough-house.