On YouTube, there is an person (he or she) named Zoombedoom. This person doesn't own any videos, but leaves comments and has favorites. On this AT video, this person claims that they have contacts within the series and the Burning Low episode proves that this person might be legit. Zoombedoom says FP is a failed experiment. Remember PB said that she had told Flame King to lock FP up, because FP was unstable. Only a Scientist who makes a crazy lemon loud mouth and two mythical immortals creatures can make the shots around a failed experiment.
Also this persons says that there might be planning a cross over episode with the Finn and Fionna worlds and one other info I won't be telling you'll.
So, what do you guys think?