Red blood - what is it and why do we need it? How does it transport important things around the body? Bob the robot needs his first aid badge so he can go to the robot jamboree - the only trouble is he is hates blood. Mark is stopped just in time by expert Charles Drew as he is about to give someone a blood transfusion from a dog!
This episode features explosions, atoms and fiendish forces that bubble, go bang and bump! What makes things explode? Lucy has made a mistake in the script and now everyone thinks the show is about elephants. It is a disaster - especially as their guest is the legendary scientist Marie Curie!