7.3 326 On the planet Dido, the monstrous Koquillion terrorizes Bennett and Vicki, the only survivors of a crashed spaceship. When the TARDIS lands, the Doctor, Ian, and Barbara team up with Vicki to discover what Koquillion is hiding. (Originally broadcast in two parts.)
Runtime: 26
Starts: William Hartnell, William Russell, Jacqueline Hill, Maureen O'Brien
Director: Christopher Barry