The TARDIS arrives on an extinct volcanic island. Before long, the travellers are captured and taken into the depths of the Earth, where they find a hidden civilisation — the lost city of Atlantis.

• BBC
• Patrick Troughton
• Anneke Wills
• Michael Craze
• Frazer Hines
• Joseph Fürst
• Colin Jeavons
• Noel Johnson
• Tom Watson