Doctor Who: The Aztecs (S01E006)

Date: Tue Jun 06 2017 Doctor Who
The TARDIS lands in a tomb which the Doctor and Companions quickly determine is in the Aztec Empire during the 1400's. This is the height of the Aztec empire, and Barbara is accidentally identified as the reincarnation of one of their Gods. The Companions are unable to return into the tomb to escape in the TARDIS and thus ensues an adventure through a slice of Aztec culture as the Doctor and Companions attempt to work out how to get back into the tomb so they can escape in the TARDIS.

Barbara has an interesting reaction to the setting. The Aztecs had many aspects to their civilization, a high degree of learning, awareness of astronomy etc, but they also performed human sacrifice. Barbara has a specialty in Aztec civilization (she's a teacher) and wanted to take the opportunity of being a God to attempt to sway the Aztec civilization to end their practice of human sacrifice.

Another thread of the story is marraige-making. The Doctor took a liking to a lady in the gardens, and ended up engaged to marry her.

All the times I've seen this I can't shake how unauthentic the weapons looked. The sets and clothes and settings, they look like they came straight from the paintings of Aztec buildings etc. But the weapons look completely wrong, but maybe it's the goofy ass fighting style. In any case it's clear they wanted this to be a serious portrayal of Aztec civilization but there are things like the goofy looking "weapons" which detract from this for me.

The most key point perhaps is the Doctors insistence that they cannot change history. The Doctor tells Barbara "You can't rewrite history! Not one line!" Yet, isn't that what Time Lords do, modify lines of history? But at times throughout Doctor Who it's been asserted some pieces of history cannot be changed. An example is in the modern Father's Day episode where the Doctor and Rose rewrite Rose's history, and that little bit of modification causes all you-know-what to break loose.

This is a question which runs through many science fiction works and is a speculation of scientists. But as we do not have good knowledge of the operation of Time, we cannot tell whether "You can't rewrite history! Not one line!" is actually accurate, or not.