The team travels to Lebanon on a rescue mission to collect lonely chimp Kiki, who has spent the past eight years in a cage that has now rusted to the point where it cannot be opened. Meanwhile, in Dorset, overweight orang-utan Oshine proves to be a surprise star pupil.

The team prepares to introduce Kiki to fellow chimp Patricia, Oshine receives a special visitor from South Africa and Bueno has emergency treatment on several rotten teeth. Meanwhile, the keepers hear sad news about the world's oldest woolly monkey, Xuzy.