Why Do Bones Break? The doctors balance a van on four leg bones to show you how strong your skeleton is, and find out how to turn your fingers into a sausage in today's body trick! [S]
Flabbergasting Favourites. In the last episode of the series, the doctors have picked out some of their favourite moments - get ready to see just how strong your tendons really are. [S]
Super Strong Skulls. Dr Chris and Dr Xand reveal how your skull protects your brain, and they're thrown in at the deep end when they find themselves running a busy GP surgery. [S]
Terrific Teeth. Dr Chris and Dr Xand show how incredible the human body is. The doctors reveal why you need differently shaped teeth to eat your food safely. [S]
Colossal Coughs. Dr Chris and Dr Xand show how incredible the human body is. The doctors reveal how big your lungs would be if they were laid out flat. [S]
Super Sensory Neurons. Dr Chris and Dr Xand show how incredible the human body is. The doctors take a dip in the sea to reveal how sensory neurons detect hot and cold. [S]
Extraordinary Ears. Dr Chris and Dr Xand show how incredible the human body is. The doctors reveal the amazing piece of body kit that helps your ears to pop. [S]
Jaw-dropping Joints. Dr Chris and Dr Xand show how incredible the human body is. The doctors reveal the secret of the special fluid which enables your joints to withstand force. [S]
Don't Panic About Puberty (Special). In this special episode, Dr Chris and Dr Xand take a look at what happens to your body, and why, when you reach puberty. [S]
Best Of... The doctors choose some of their favourite moments, including an experiment to find out what happens when you cough and a life-changing operation. [S]
Episode 8. 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. [S]
Episode 7. 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. [S]
Episode 6. The doctors look at kidneys and reveal how these amazing cleaning machines work. Also the ouch-mobile is open for more medical mysteries. [S]
Episode 5. 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. [S]
Episode 4. 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. [S]
Episode 3. With the help of opera singer Lucy O'Byrne, the doctors reveal the hidden muscle that makes you breathe. Then, Dr Xand heads to a DNA laboratory to solve a mystery. [S]
Episode 2. Dr Chris and Dr Xand 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. [S]
Episode 5. The doctors fill their bladders, quite literally, to show what happens when you go for a wee. Meanwhile, in accident and emergency, one patient has swallowed a coin. [S]
Episode 4. The doctors reveal how you taste with your nose as well as your tongue, and Dr Chris discovers how 3D printing works when he prints his own skull. [S]
Episode 2. The doctors reveal how far a heart can pump blood, Dr Xand meets a life-saving dog, and Dr Chris is in the ouch-mobile solving more medical mysteries. [S]
Episode 1. Dr Chris trains as a nurse on a ward full of robotic patients, and Dr Xand opens up the ouch-mobile - a drop-in clinic for all medical mysteries. [S]
Episode 7. The doctors prove that we all have invisible ink inside our bodies, and Dr Xand sees head lice removed from someone's hair with a vacuum cleaner. [S]
Episode 6. The doctors look at the awesome work that goes on inside the liver, and Dr Chris extracts snot from members of the public for a very useful experiment. [S]
Episode 5. The doctors take a closer look inside their ears to prove how earwax has a really important job to do, and Dr Xand meets a pioneering professor who makes body parts. [S]
Episode 4. Dr Chris uses a tiny camera to reveal what happens in his throat when he swallows food, and Dr Xand enters a special chamber that removes sensory data from his brain. [S]
Episode 3. The doctors take a close-up look at how the eye works, and Dr Chris finds out what body fat does by looking at some of his own under a microscope. [S]
Episode 1. The doctors reveal what lurks inside the plaque on your teeth, Dr Chris uses a remote-controlled car powered by his own wee, and Dr Xand decides to get his verruca treated. [S]
Episode 11. Series about the world of medicine and biology. The doctors take on their smelliest investigation yet and Dr Xand visits the largest blood factory in the world. [S]
Episode 10. Series about the world of medicine and biology. Dr Chris swallows a supercool camera pill to follow the journey that food makes through his body. [S]
Episode 9. Series about the world of medicine and biology. The doctors investigate what happens when blood is full of oxygen by whisking up a blood smoothie. [S]
Episode 6. Series about the world of medicine and biology. Dr Chris explains what happens to your body when you feel travel sick, and Xand finally finds out if he really does snore. [S]
Episode 5. Series about the world of medicine and biology. Dr Chris inserts a tube to Dr Xand's nose and down into his belly to prove that the nose, mouth and stomach are all connected. [S]
Episode 4. Dr Chris and Dr Xand experiment and explore their way through the fascinating world of medicine and biology. The doctors see how much pain they can take in their laboratory. [S]
Episode 3. Dr Chris and Dr Xand experiment and explore their way through the fascinating world of medicine and biology. The doctors demonstrate how our body movements are controlled. [S]
Episode 2. Dr Chris and Dr Xand experiment and explore their way through the fascinating world of medicine and biology. The doctors show what really happens when you sneeze. [S]
Episode 1. Dr Chris and Dr Xand experiment and explore their way through the fascinating world of medicine and biology. The doctors experiment on their muscles to show how they work. [S]