It's roller disco day and everybody is having lots of fun, except for Doctor Knowles who just can't quite seem to get the hang of it! The crack TV science team investigate the big question 'How many atoms are there in our bodies?'.

Knowles and McCork ask 'Why do we make saliva while we eat?' Backstage, the crew is awaits a very special guest - it's only Colin's biker mum, Janis!

McCork and Knowles boldly go where no professor or doctor have gone before to answer the big question 'Where does poo come from?' They climb aboard the Pooper Snooper on this very special mission - but this experiment really can't go because they have been shrunk down and are broadcasting live from the digestive system of Colin the floor manager.