The TARDIS materialises inside an Aztec tomb. Outside it, the Doctor and his companions soon discover that Mexico in the 15th century is a bloodthirsty and dangerous place... And with Barbara mistaken for a reincarnation of an ancient high priest called Yetaxa, the history teacher thinks that she can put an end to the barbaric human sacrifices once and for all. But can she rewrite history without disastrous consequences?
| Actor | Role |
|---|---|
 William HartnellThe Doctor | The Doctor |
 Carole Ann FordSusan Foreman | Susan Foreman |
 Jacqueline HillBarbara Wright | Barbara Wright |
 William RussellIan Chesterton | Ian Chesterton |
| KKeith PyottAutloc | Autloc |
| JJohn RinghamTlotoxl | Tlotoxl |
| WWalter RandallTonila | Tonila |
| AAndré BoulayPerfect Victim | Perfect Victim |
| IIan CullenIxta | Ixta |
| MMargot Van der BurghCameca | Cameca |
 Dave AndersonAztec Captain | Aztec Captain |
| TTom BoothFirst Victim | First Victim |