Goliad
Princess Bubblegum makes a creature to rule when she is dead. She names it Goliad. It is much bigger than she. She lets Finn and Jake teach Goliad but they quickly find out that it has bad instincts and that it has learned from their bad examples. They tell Princess Bubblegum what happened. She gets to work on building another creature (Stormo) to counter Goliad while they keep Goliad distracted.
Thoughts
I enjoyed this episode but it felt like an incomplete story. Maybe Goliad and Stormo will return in a future episode.