Debbie is called to Yonderland when the Elders hear news that a vicious monster is placing the last survivor of a noble species at risk.

The discovery of a wish granting tree causes chaos in Yonderland. At the same time, Imperatrix launches her deadly secret weapon.

With the evil empress Imperatrix gone, Negatus thinks that he can finally take control of Yonderland for himself, but his fellow overlords may have other ideas. Former elder Cuddly Dick returns having been imprisoned for years under Imperatrix's regime and is welcomed back with open arms. Back in the real world, Debbie's husband Peter has been offered a promotion that means the family must relocate to Glasgow.