The Box Prince / Red Starved

S5 E218: The Box Prince: Finn meets the Box Prince (a cat with a box on its back) and discovers the Box Kingdom has been taken over by an impostor. Now, Finn must help the real Box Prince reclaim his rightful throne. / Red Starved: Finn, Jake and Marceline are trapped in an underground cavern with no red in sight. If Marceline doesn't feed, like ASAP, she will turn into a vampiric beast and suck out all of Jake's blood! So, Finn heads off to explore the cave and find something red to satiate her until they can be rescued. But time is running out!