Doctor Who: EVERY NuWho Villain And Monster Ranked Worst To Best

Appear in: The Fires of Pompeii.

They were only following the orders of their rock steady Reverend Mother. And you would, given her positive prediction of "an endless Empire of Pompeii, reaching out from this city to topple Rome itself, and encompass the whole wide world". Furthermore, you'd want to protect this fabulous prophecy - at all costs.

Especially when our Donna's going about the place expressing "false prophecies" of Mount Vesuvius exploding and burying Pompeii - so the the pissy High Priestess ordered her to be sacrificed.

Although it's Sister Spurrina, who's essentially the group's team leader/supervisor, who almost plunged a massive knife into Donna, it's still a collective responsibility. Anyway, anyone who can psychically communicate via painted eyes on the back of their hands smacks of dodgy practices.