With Ian having fallen victim to the Sensorites' plague, the Doctor is desperate to find a cure. But the City Administrator is still determined to rid his world of aliens.
Did You Know?
Barbara is absent from this episode in order to give Jacqueline Hill
a holiday during production. See more
As Ian, Susan and the First Elder wait for the antidote, a boom microphone drops into shot and casts a shadow across the First Elder's head. See more