The boys get their hands on backstage passes for some willing helpers to get stuck in at the country's busiest veterinary clinics, wildlife sanctuaries and animal rescue centres. Their volunteers are up for a massive challenge but they are not all big animal lovers. Will a day on the frontline looking after wounded wildlife and poorly pets change their minds?Volunteers Quasim and Haroon are in at the deep end as they help hundreds of pongy hedgehogs, assist in a life-saving operation and release a deer in a secret wood. Meanwhile, Intisar and Shannon go on safari to help Britain's bats and track down five of the UK's native reptiles. Plus, Dick and Dom play chicken with Henrietta the Hen as they try to become assistant vets.

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Olly and Oscar look after wildlife babies, enter a bat tent for a test flight and get to grips with a thirsty fawn. Will Keisha and Mercy end up tongue-tied whey they try out donkey dentistry at a sanctuary? And Dom squares up to a massive mute swan that needs his help.