“This is no cave.” When a movie monster can be identified by one line of dialogue, you know it’s successful. Also known as the exogorth, the space slug — aptly nicknamed, as it’s a giant slug that lives in space — features heavily in one of The Empire Strikes Back‘s most famous scenes. (The Millennium Falcon unknowingly docks inside its belly and then must narrowly escape its closing jaws.) The space slug sequence puts a clever spin on the trash compactor scene from A New Hope, further illustrating the danger-all-around-you element of Star Wars, and how once you think you’re safe, you’ve probably just run into — literally, in this case — a bigger problem.