When eccentric candy man Willy Wonka promises a lifetime supply of sweets and a tour of his chocolate factory to five lucky kids, penniless Charlie Bucket seeks the golden ticket that will make him a winner.

The Doctor, Vicki and Steven arrive on an arid planet where they meet the beautiful Drahvins and the hideous Rills. Each has crash-landed after a confrontation in space. The Rills are friendly, compassionate explorers. The Drahvins are dull-witted, cloned soldiers, terrorised by the intelligent, warlike matriarch Maaga.