In the penultimate episode of the series Luke is in the tropical rain-forests of this Central American nation and he is most certainly outside his comfort zone as he travels the length and breadth of the country helping a host of different animals. After attempting to catch a fiery raccoon, Luke is presented with one of those moments that can never be predicted: teaching a newborn sloth to pooh. At a local horse ranch, Luke tries to change the traditional method of castrating the horses. Jumping on a boat he journeys to a remote tropical island where he gets friendly with a group of howler monkeys, a baby anteater and wild boar. But there is one last surprise in store as Luke is told he must take a local surgical exam before he can operate on a small island full of castaway dogs. Will he pass?