A Cephalopod's Castle is the 13th episode of the spin-off, Absorbent Days, and the thirteenth episode of season one. In this episode, after SpongeBob enrages Squidward with another one his stunts and tricks, Squidward decides to travel somewhere, yet he doesn’t care where. On his trek, he encounters many different people, things, and environments. He then comes across a hotel named “Cephalopod Castle”, a hotel specifically for squid. Will Squidward learn the secret behind this so-called hotel… and learn an important lesson at the same time?