The Wild at Heart star journeys across Africa in a hot-air balloon, observing wildlife and meeting people who work to preserve animal habitats, beginning in Serengeti National Park, Tanzania. The actor crash-lands into dense vegetation and is rescued by the local Maasai, before he practises his veterinary skills back on terra firma. Stephen then takes a tribal chief for a ride in his balloon and treks through Rwanda's dense forests in search of mountain gorillas.