Dr Knowles and Professor McCork ask the question 'Which animal can turn invisible?' and backstage, the annual Brain Freeze hide and seek day is kicking off. Anyone can play but poor McCork is still struggling to grasp the basic rules of the game.

Dr Knowles and Professor McCork ask the question 'Could pineapples grow on the moon?' while battling with a lack of oxygen, homesickness and some bad chocolate etiquette. Colin and Ms Hucklebuck remain at Ground Control in the Brain Freeze studio and hope that there isn't a bad atmosphere.

Judge Knowles presides over the Brain Freeze court to try to solve the mysterious disappearance of Ms Hucklebuck's tooth, which she had left out for the Tooth Fairy. There has to be a simple explanation and also an answer to the question 'Why do we have baby teeth?'.