10 Dark Doctor Who Facts That Are Never Spoken About

The thing that sets the TARDIS apart from any other time machine in fiction is the fact that the iconic blue box is alive. It has a personality, it has thoughts and feelings, and it's even taken physical form before.

The TARDIS is more than just a vehicle – it's a character in the show.

This is why it was rather odd when the Thirteenth Doctor killed one without a second thought at the end of Revolution of the Daleks, after luring a fleet of Daleks into the ship and forcing it to collapse in on itself.

This is the same Doctor who met and spoke to their TARDIS in The Doctor's Wife, gaining a deeper understanding of their travel buddy in the process. Upon visiting a TARDIS graveyard in that episode, the Doctor's TARDIS states, "All of my sisters are dead, and we are looking at their corpses" – the implication being that all TARDISes are sentient to some extent.

On other occasions, the show has gone out of its way to explain that these time-travelling vessels are living organisms. They're grown, not built, and they don't break – they die.

Saving the day is all well and good, but the Thirteenth Doctor nonetheless committed an act of murder here. Wonder what her TARDIS thought about that.