The Doctor, Nardole and others in “World Enough and Time”

Bill? Bill, talk to me. What have they done to you?

Operation Exodus… whatever that is.

[from behind them] Well, wrong name, for a start.

I… waited.

[standing at one side of Bill] This is not an exodus, is it? More of a beginning, really, isn't it?

I… waited.

[from behind the Doctor] In fact, d'you know what I'd call it? [enters and stands on the other side of Bill]

I'd call it a genesis.

You've met the ex.

Specifically… the genesis of the Cybermen.

[pointing at the Doctor] I… waited… for you. [a single tear runs from Bill's left eye and through her cybermask]