Two spacecraft fuse in a hyperspace collision. Fortunately the Doctor, Romana and K-9 arrive to help. But when a crewmember is found clawed by a ferocious animal, it seems there’s something even more frightening stalking the corridors. The answers lie with zoologist Professor Tryst, his CET protection machine, and a planet called Eden – the home of the ferocious Mandrels. 1 2/3 hours on 1 disc. SDH