Jimbo Jambo is a travelling showman, who along with his best friend Phil and son Tin, sell their miracle tonic to a sometimes unbelieving public. The tonic is based on an old family recipe and it help's cure family pets of their ailments. When they stumble upon an amazing new use for their miracle tonic however, it starts them on a roller coaster journey they will never forget. Will they help the Duchess win her race? Will they get the better of Sir Charles? Only one way to find out!