The TARDIS brings the Doctor, Susan, Barbara, and Ian to the planet Skaro where they meet two indigenous races — the Daleks, malicious mutant creatures encased in armoured travel machines, and the Thals, beautiful humanoids with pacifist principles. They convince the Thals of the need to fight for their own survival.

• BBC
• William Hartnell
• William Russell
• Jacqueline Hill
• Carole Ann Ford
• Peter Hawkins
• David Graham
• Robert Jewell
• Kevin Manser