He knows it to be true. IAN: The TARDIS. CAMECA: We are a doomed people, my dear. Barbara? TLOTOXL runs in.) There is a back and forth flurry of blows - IAN is knocked back, to the edge of the temple floor. The DOCTOR stares at the body of Yetaxa for a moment.
Plan: A: the TARDIS; Q: What vehicle leads the Doctor and his crew to the Aztec people? A: 15th century; Q: When did the TARDIS arrive in Mexico? A: the doomed Aztec people; Q: What people do the Doctor and Barbara meet in Mexico? A: brutal savagery; Q: What is the Aztec people a mixture of high culture and? A: Matters; Q: What is further complicated when Barbara is mistaken for a god? A: a god andthe Doctor; Q: What is Barbara mistaken for? Summary: The arrival of the TARDIS in 15th century Mexico leads the crew to the doomed Aztec people, a mixture of high culture and brutal savagery. Matters are further complicated when Barbara is mistaken for a god andthe Doctor becomes engaged to be married.