NYSSA: What's the matter?

TEGAN: It's only sunk in properly, what happened to me on Deva Loka.

NYSSA: What? The Doctor said nothing eventful had occurred.

TEGAN: He would. But while you were enjoying forty eight hours peaceful sleep in the delta wave augmenter, my mind was occupied. Taken over.

NYSSA: By whom?

TEGAN: More a what. Something called a Mara. It makes me shiver to think of it.