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Dr Chris and Dr Xand explore their way through the world of medicine and biology.

The doctors reveal what makes you flexible as they test the incredible strength of a tendon to the max, and they find out what it's like to be an air ambulance pilot in Operation Takeover. Dr Xand uncovers if laughter really is the best medicine, and we meet the first of our Ouch Patients to find out what it's like to be a regular hospital patient. Meanwhile, in accident and emergency, one patient has surgery to fix a leaking bone graft, while another is treated for a dancing injury.

The doctors reveal how amazing your saliva is, and they find out why the hospital's maintenance team work with birds of prey in Operation Takeover. Dr Chris heads to the Emergency Department to find how the doctors know who to treat first, and we catch up with Ouch patients Ruby and Tola. Meanwhile in accident and emergency one patient arrives by air ambulance after a rugby match and another has a cut on her foot after it was caught in a bike wheel.

The doctors reveal how your eardrum works to enable you to hear, and they find out how tough it is to be hospital radio hosts in Operation Takeover. Dr Chris discovers what it takes for anaesthetists to keep you safe and pain-free during operations, and Ouch and About On Call hit the wards to answer patients' medical questions. Meanwhile, in accident and emergency, one patient comes in with a cut to his hand and another is treated for a football injury.

The doctors reveal why your body can't survive without oxygen for more than three minutes, and they find out what it's like to be 999 call handlers in Operation Takeover. Dr Xand investigates how Formula One race car technology can help hospitals, and Dr Chris hits the wards in Ouch and About On Call. Meanwhile in Accident and Emergency, one patient comes in after a bike accident and another has fallen on her wrist.

The doctors reveal the special cells in your eyes which help you to see out of the corner of your eye, and they find out what it takes to be a hospital entertainer in Operation Takeover. Dr Chris heads to a laboratory where scientists are making blood from stem cells, and more medical mysteries are answered in Ouch and About On Call. Meanwhile in Accident and Emergency, one patient is brought in by air ambulance after cutting her chest and another has hit his head on a goalpost.

The doctors reveal how important cartilage is to your body with the help of a suit of armour, and they find out what it takes to be a hospital porter in Operation Takeover. Dr Chris meets Nala the dog to see how she helps patients in hospital, and we meet two more of our ouch patients to find out what it's like to be a regular hospital patient. Meanwhile, in accident and emergency, one patient arrives by air ambulance and another is treated for a spring stuck in his thumb.

The doctors reveal the amazing job your pancreas does to keep your blood sugar levels in check, and they find out what it's like to be the hospital postman in Operation Takeover. Dr Xand investigates how scientists make bioglass to help doctors mend damaged bones, and we catch up with all four of our Ouch patients for one last time. Meanwhile, in accident and emergency, one patient arrives by air ambulance after falling on a spiky fence and another has come off her bike, cutting her chin.

The doctors reveal the amazing army of germ-fighters that make up your immune system, and they find out just how difficult it is to clean a baby's incubator in Operation Takeover. Dr Xand meets Alex who has Autism, and we catch up with Ouch Patients Holly and Haiden in. Meanwhile, in Accident and Emergency, one patient has cut her nose and another has injured his toe.

In the last episode of the series, the doctors reveal the amazing strength of your jaw, and they see if they can take the heat when they try their hands at being hospital ward chefs in Operation Takeover. Dr Xand joins the ear, nose and throat department to see how they fix their patients, and Dr Chris hits the wards answering questions for one last time in Ouch and About On Call. Meanwhile, in accident and emergency, one patient is treated for an injury to her neck, and another has cut his foot on a tin lid.

The doctors find out why we burp and even manage a world-first when they film Dr Xand burping from the inside. They also get behind the wheel to discover what it takes to be a good ambulance driver in Operation Takeover. Dr Xand joins the radiology department to find out how they see inside our bodies and Dr Chris is answering medical questions on the wards in Ouch and About On Call. Meanwhile in Accident and Emergency, one patient has cut her hand doing arts and crafts, and we meet a familiar face with a dislocated jaw.

The doctors investigate why we need eyebrows and in Operation Takeover they find out just how tough it is to work in the hospital pharmacy. There are more medical mysteries solved on the wards in Ouch and About on Call and when Dr Xand spills hot beans on his leg it's First Aid to the rescue as we find out what to do if someone has a severe burn. Meanwhile, in accident and emergency, one patient has injured their toe in Jujitsu class and another hurt her finger doing the crab.

Dr Chris and Dr Xand reveal how your brain enables you to learn new things with the help of three human 'samples' from the Cupboard-of-Everything, a giant pile of sand and some water. In Operation Takeover, the twins join the fire service and discover how tough it is to rescue people in a fire. Dr Chris heads to the ophthalmology department to find out how to treat a lazy eye, and we catch up with Ouch Patients Bolu and Millie. Meanwhile, in accident and emergency, one patient has dislocated her ankle and another has injured his knee in the playground.

Dr Chris and Dr Xand turn back the clock and look at what medicine was like in the First World War. They meet a Paralympian runner who swaps her awesome blade for a World War I leather leg, and they look at the little critters that infested the trenches. Then they set up a massive experiment to demonstrate how soldiers' bodies had to cope with the pressures exerted by huge explosions.

The Doctors investigate how oxygen works in your blood, Dr Xand takes a look at some diseased bones and organs, and Dr Chris goes on call with an emergency ambulance team. Meanwhile, over in accident and emergency one patient has grazed his face after a bike accident and another has an infected finger!

The Doctors explore inside Dr Chris' digestive system using a super cool camera pill. Dr Xand meets someone who grows real bones in a laboratory and over in accident and emergency one patient needs surgery on a broken elbow and another has scratched their eye!

The Doctors reveal how your bones grow to make you taller, and in Operation Takeover they take on the role of midwives for the day. Dr Chris investigates how scientists are studying people in low oxygen conditions to help seriously ill patients and we catch up with Ouch Patients Kaden and Maisie.

The doctors make an unusual type of cheese with Xand's body bacteria, find out what to do if someone breaks their leg in First Aid, and Dr Chris meets a man with a bionic eye. Meanwhile, in accident and emergency, one patient has been injured doing handstands and another has a badly broken arm.

The Doctors reveal the amazing type of muscles that help you see.... and go for a poo! And they're thrown in at the deep end when they find themselves running the reception desk of a busy GP surgery for Operation Takeover. Find out how to deal with a severe allergic reaction in First Aid and we catch up with Ouch Patients Millie and Bolu.

The Doctors investigate how eating different foods can drastically affect your poo. Dr Xand donates his blood and finds out how it is processed to help save lives and Dr Chris visits an emergency Air Ambulance team. Meanwhile, over in accident and emergency one patient has cut her hand playing football and another has a cut eyebrow!

The Doctors set fire to food [all in the name of science!] Dr Xand goes to an Asthma clinic, and in Ouch & About the Ouch-Mobile opens its doors to solve more intriguing medical mysteries. Meanwhile in Accident & Emergency, one patient has slipped off a slide and broken his wrist, and another needs surgery to fix her dislocated knee.

The Doctors get competitive in a race to reveal what happens when blood vessels get blocked, Dr Xand goes for some physiotherapy, and Dr Chris is out with the emergency services helping a man with chest pain. Meanwhile in Accident & Emergency, one patient has hurt his neck playing rugby, and another has cut his head being a superhero

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, and discover who the better pilot is when Dr Chris and Dr Xand join the Air Ambulance in Operation Takeover. Find out how to help someone who's been drowning in First Aid, and catch up with our four Ouch Patients for one last time.