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.

• BBC
• William Hartnell
• Maureen O'Brien
• Peter Purves
• Stephanie Bidmead
• Marina Martin
• Susanna Caroll
• Lyn Ashley
• Jimmy Kaye