Fringe, Season 4

Peter:
It's not Nina working for them that worries me. I've been wracking my brain, why would Nina be dosing Olivia with cortexiphan? Then it occurred to me: the only person who's ever done anything like that, at least in my timeline, is David Robert Jones. Maybe he's trying to do the same thing again.

Walter:
Do what?

Peter:
Activate Olivia.

Walter:
For what purpose?

Peter:
I don't know. We could never figure it out, but maybe it's for the same reasons now.

September:
[having appeared out of thin air] Yes. His goal is the same. [collapses]

Peter:
[rushes to September's side] You! Talk to me! What do you know about David Robert Jones? What do you know about Olivia?

September:
She needs you.