Overview: When Professor Popper starts his great experiment in the school laboratory no one knows quite how it will end, but it gives Simon, his young assistant, a shrinking feeling ...
Overview: Will Professor Crabbit discover what has happened to his old friend Professor Popper and his young assistant Simon? And who are the two mysterious strangers?
Overview: Will the two strangers steal the formula? And how can the professor and Simon escape?
Overview: The Professor now has more problems. Will Elizabeth be able to get help and find the antidote to the shrinking pills?
Overview: How can the professor and his friends escape from the two mysterious strangers?
Overview: How can Elizabeth find a way to save the Professor and her school friends from the two crooks?