Intro: Tonight, The Doctor and friends embark on a scavenger hunt which will take them to the city of Morphoton, a deserted jungle, an ice-bound wilderness, and the city of Millenius in a quest for "The Keys of Marinus."

Outro: Is Barbara the reincarnation of Ixta, the quondam high priestess of the Aztecs? The truth will out next Sunday night at 11 when the TARDIS carries its crew to the year 1430 and a tomb in the land of "The Aztecs." [source: ChicagoEpguides]