How much fear can a person hold in their guts? Let’s find out with poots, submarines, and concussions! Finn and Jake explore Ooo’s vast ocean from underneath. Meanwhile, back in the studio, Royal Empress Godqueen Velvet tries to save the audience from the machinations of another Rosecat monologue. But, will her thirsty clicks be heard over the sad sound of Mahadopus talking about his childhood?