Meet a girl whose heart has formed outside her ribcage, a man who can spend nine minutes underwater without taking a breath and a woman who is growing a second skeleton.
This episode looks at the human body's amazing capacity for survival. Meet a man who injects himself with deadly snake venom, and another who is the only person in the world to be completely cured of HIV.
Revealing some of the most extraordinary medical cases ever, meet a man who feels no pain, a woman who can smell Parkinson's disease and a head-injury survivor who can suddenly play the piano.
Meet a girl with two hearts, a man who can sing two notes at once, a woman who can bend in amazing ways, a girl who is allergic to everything and a man who can run 350 miles without stopping.
A man with bones as strong as granite, a woman who became pregnant with twins in two separate wombs, a girl whose arm won't stop growing and a woman who gets lost in her own home.
Meet the incredible engineer who fixed his own heart and a man who can taste words. Also, find out how a man who has multiple sclerosis can now cycle and scuba-dive thanks to a pioneering new treatment that has reversed his disease.