The Aztecs

The TARDIS arrives in 15th Century Mexico and the crew encounter the doomed Aztecs, who are a mixture of high culture and savagery. Barbara is mistaken for one of the Aztecs’ Gods, complicating matters considerably.

The Keys of Marinus

The TARDIS crew are forced to fulfil a quest for the people of the planet of Marinus to retrieve four of the five keys of the Conscience of Marinus, which are scattered around the planet, to ensure that the Voord do not get control of the planet.

Marco Polo

The TARDIS lands in Central Asia in 1289, with the Doctor and his companions joining the travelling caravan of Marco Polo, the Venetian explorer. Travelling from the Pamir Plateau, through the Gobi Desert and into Imperial Cathay, they encounter many dangers, before meeting the aged Kublai Khan in Shang-Tu. Travelling to Peking, the TARDIS team save Khan from an assassination team before travelling off in the TARDIS.