Three siblings, Ben, Tom, and Melinda Potter (better known as Lindy), meet Professor Savant while visiting the zoo one rainy day.

On Halloween, Lindy gets dared by her brother to knock on the spookiest house on the block for a quarter, which happens to belong to the Professor, and the three become more acquainted with him.

However, fearing that people were losing their imaginations in the pursuit of power and greed, the Whangdoodle created a magic and peaceful world over which he reigns.

However, the Whangdoodle's Prime Minister, the "Oily Prock", does not want them to disturb His Highness, and sets up some traps, both in Whangdoodleland and the real world to prevent this meeting.

He enlists the marvelous and funny creatures of the land in his effort, including the High Behind Splintercat, the Sidewinders, the Oinck, the Gazooks, the Tree Squeaks, and the Swamp Gaboons.