Wildlife vet John Lewis provides a health check for stump-tailed macaques who have recently arrived from a lab facility in Scotland, but discovers they have serious dental problems. Meanwhile, ring-tailed lemur Kaiyah has her first taste of life in the trees.

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.