Best Of…

28m

The doctors choose some of their favourite moments, including an experiment to find out what happens when you cough and a life-changing operation.

Before You Were Born

27m

The doctors reveal the amazing organs that keep you alive before you're born, and Dr Xand meets patients undergoing treatment at a burns clinic.

Fire In The Lab!

27m

Dr Chris and Dr Xand find out what happens when you eat with the help of a miniature Xand doll, and Dr Chris is at work fighting infectious diseases.

Superhero Kidneys

27m

The doctors look at kidneys and reveal how these amazing cleaning machines work. Also, the Ouch-Mobile is open for more medical mysteries.

The Big Skin Mystery

27m

The doctors test a new theory to see if they can find out why skin goes wrinkly in the bath, and Dr Chris meets a patient taking part in groundbreaking heart research.

What's In Your Diarrhoea?

27m

The doctors reveal what happens when you get diarrhoea, Dr Xand meets Alexia and Kloe from CBBC's Ice Stars, and there's a hidden camera experiment.

Who Stole The Milk?

27m

With the help of opera singer Lucy O'Bryne, the doctors reveal the hidden muscle that makes you breathe. Then, Dr Xand heads to a DNA laboratory to solve a mystery.

Can I Borrow Some Of Your Blood?

27m

The doctors reveal where your blood comes from, Dr Chris meets a patient undergoing life-changing brain surgery and there is a trick to test the powers of concentration.

How Your Nerves Work

27m

Dr Chris and Dr Xand reveal the surprising secret behind the speed of your nerves, and Dr Xand finds out what happens if you don't wash your hands.

The Bits That Make You Scream "Ouch!"

28m

Dr Chris and Dr Xand demonstrate what to do if someone chokes, and the Ouch-Mobile opens its doors to help solve more medical mysteries.