In this final episode, Michael Mosley reveals the ingenious ways in which the body defends itself against a hostile world - where sunlight shatters DNA and every breath contains microbes that can kill. He meets Cristian, a bull jumper whose muscles give him the strength to avoid a violent death, three-year-old Rowan whose internal army fights off the flu virus, and Johnny, who gets injured almost every week earning his living and relying upon his body's remarkable ability to heal itself. And when injuries are too severe to be repaired, the programme documents how surgeons use medical expertise to exploit the body's natural healing powers. Richard Edwards is filmed having his damaged hands cut off and replaced with someone else's - the first time something this radical has ever been attempted.
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