Professor Popper (Charlie Drake) develops a shrinking formula with which he plans to solve the world food crisis.
The idea is that vast stocks of food can be sprayed and reduced to a single plane-load, flown to any famine area in the world and then treated with an antidote which restores the load to its original size.
But the eccentric professor and a group of school kids take the formula by accident, ending up trapped in his laboratory.
The plot thickens when a gang of London villains plan to steal the formula and spray it all over the Bank of England, reducing it to the point where it can be packed in a suitcase and sold to the Americans.
Popper hangs on to the formula in a hair-raising chase with a giant tarantula spider and a remarkable ride through London aboard a roller skate.
Professor Popper
Charlie Drake
Simon
Adam Richens
Liz
Debra Collins
Terry
Philip DaCosta
Angus
Todd Carty
Carol
Karen Saunders
Peter
Eric Holloway
Professor Crabbit
Milo O’Shea
Crickle
Sydney Bromley
Headmaster
Richard Caldicot
Grainger
Alan Curtis
Rollins
Leo Maguire
PC Whitby
Keith Smith
Director
Gerry O’Hara