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?
| Directing | John Crockett | Director |
| Writing | John Lucarotti | Writer |
| Production | Verity Lambert | Producer |
| Production | Mervyn Pinfield | Associate Producer |
| Sound | Marcus Dods | Conductor |
| Costume & Make-Up | Daphne Dare | Costume Design |
| Crew | Derek Ware | Fight Choreographer |
| Sound | Richard Rodney Bennett | Music |
| Costume & Make-Up | Jill Summers | Makeup Supervisor |
| Writing | David Whitaker | Story Editor |
