The TARDIS arrives in fifteenth century Mexico inside the tomb of one-time Aztec High Priest Yetaxa. The travellers become cut off from the ship when they explore the temple outside and the tomb door closes behind them. Barbara is proclaimed by the High Priest of Knowledge, Autloc, as Yetaxa's divine reincarnation. However, she incurs the enmity of the High Priest of Sacrifice, Tlotoxl, when - against the Doctor's advice - she attempts to use her new-found authority to put an end to the Aztec practice of human sacrifice. 1 2/3 hours on 2 disc. SDH