The doctors reveal the amazing organs that keep you alive before you're born. Dr Xand meets patients undergoing treatment at a burns clinic, and Dr Chris hits the high street to test another mind-bending trick. Meanwhile, there are more medical mysteries in Ouch and About, and over in accident and emergency one patient has broken her ankle and another has been hit on the head with a cricket bat.

In this special episode, Dr Chris and Dr Xand take a look at what happens to your body, and why, when you reach puberty. Spots are in the spotlight, Dr Xand finds out why you sweat more, and Dr Chris discovers the real reason teens don't want to get up in the morning. There are also some animated top tips on how to get through puberty, and the doctors do some house calls... with a difference.