A silly premise with an interesting execution and some really fun visuals. Everyone likes to joke about the prawn monster, and justly so, but the brain set was really innovative. Leela got to show off her hunting and tracking skills quite a lot, which is always fun. She and the Doctor got a nice bit of banter throughout, as well. And of course, it's K-9 at his most effective in his introductory story. The resolution felt a little lackluster, but the first three episodes were quite solid!