First Doctor, 1964, story 9, The Aztecs.
THE TEMPLE OF EVIL (1)
The TARDIS crew arrive in Mexico in the 15th century in the inner sanctum of an Aztec tomb. Barbara and Susan leave the TARDIS first and begin to explore the crypt. Barbara, whose specialist knowledge is on the Aztecs, finds a bracelet and absentmindedly puts it on. Susan finds a door in the wall, which Barbara goes through. Susan goes back to the TARDIS for the others. Barbara is met by a man who, thinking she is a trespasser, fetches warriors. When the warriors come for her, however, he sees the bracelet on Barbara's wrist and his opinion changes.
When the First Doctor and Ian go through the trap door, they find Barbara gone. Even more worrisome, once all of them are through, the door closes behind them and refuses to open. The Doctor says that it would have been built to allow the gods out, but not allow grave robbers in. Soon the man that accosted Barbara returns and introduces himself as Autloc, the High Priest of Knowledge, and says that Yetaxa seeks an audience with them. The travellers go to meet this deity. On their way they encounter the High Priest of Sacrifice, Tlotoxl. When the travellers are taken to Yetaxa they are surprised to see that it is Barbara. Once they are alone, she explains that as she was wearing Yetaxa's bracelet when she was captured, the Aztecs believe her to be a reincarnation of the deceased high priest, and therefore a god.
Barbara demands the Aztecs give the Doctor and Ian free run of the civilisation. Although they agree, Tlotoxl has ideas of his own. He convinces Autloc that Ian should be the leader of their army, to which Ian begrudgingly agrees. While Ian goes to meet Ixta, his rival for command, the Doctor is taken to the Garden of Peace. Here he meets Cameca, a local sage and philosopher, of whom he quickly becomes very fond. This does not stop him from smooth-talking her into a meeting with the son of the designer of the temple Topau, to find a way of retrieving his TARDIS from the centre of the tomb.
Ian meets up with the Doctor again and says that in order to prove himself to Autloc and Ixta, he needs to escort the person to be sacrificed to the god of rain to put an end to a drought. Ian is reluctant, but the Doctor says that he has to do this to not blow their cover. The Doctor tells Barbara of this, and Barbara refuses to allow it. She believes that if she stops human sacrifices, the Aztecs will not become extinct and will live on as a better civilisation. The Doctor tells her that she cannot change history. Barbara remains obdurate. Just before the sacrifice takes place, Barbara puts a stop to it. Both Ixta and the first victim are outraged. The sacrifice, furious that he has not had the chance to prove himself, is encouraged by Tlotoxl to throw himself from the top of the tomb, which he does. The rains soon come. Triumphant, Tlotoxl says that this proves that sacrifices are necessary. Barbara denies this, and says that sacrifices shall no longer be practised. This infuriates Tlotoxl, who vows that he will unmask Barbara as the fraud that she is.
THE WARRIORS OF DEATH (2)
The Doctor berates Barbara for interfering. Tlotoxl now suspects that she is not a real god, and Susan has been taken to a seminary after her outburst. However, the Doctor soon brightens up when he recounts to Barbara his encounter with Cameca and the chance he could learn more about the construction of the tomb. Meanwhile Ian and Ixta are practising for their showdown. Ian is irritated by Ixta's boasting, and states that he could kill Ixta with just his thumb. He soon proves this by applying his thumb to a pressure point at the back of Ixta's neck that renders him unconscious. Tlotoxl enters to this sight and is shocked to see that Ian is gaining the upper hand over his favoured candidate. Autloc says that as Ian has disarmed Ixta, he is the rightful commander of the Aztec army. Desperate to prevent this, Tlotoxl convinces the next human sacrifice, the Perfect Victim (whose last days are spent in total control of those around him), to order that another, more equal contest be held. This is agreed to. Tlotoxl offers Ixta untold riches if Ian is killed in their battle.
Meanwhile in the Garden of Peace, the Doctor and Cameca share stories and flirt. He convinces her he should meet the son of the tomb's designer by saying that he is only called the Doctor because he is "a scientist, an engineer. I'm a builder of things." When Cameca leaves to ask the son, it is clear that the Doctor is smitten by her. Tlotoxl visits Barbara and warns her that he is getting more people to believe that she is not the real Yetaxa. He begins to question her on knowledge of their ways, but she counters that such should be done by the High Priest of Knowledge. He says that Autloc will question her later. Until then she is confined to the tomb. To tease her, he tells her of the fight that is to take place between Ian and Ixta. This clearly distresses her.
