The Ark (airdate September 28, 1986)
Intro: Usually, a common cold is a minor inconvenience, whose symptoms can be alleviated with aspirin and antihistamine. Tonight, the consequences of Dodo's cold assume far greater significance, as we shall soon learn. Stay tuned now as the Doctor and friends take up temporary residence on "The Ark."
"Next Week": Exactly what happened in Tombstone, Arizona on October 26, 1881? The Doctor, Steven, and Dodo will find out next week when they meet "The Gunfighters."