Jeff's first scene, when they visit the grandma's after first finding out that everything's broadcasting about Prisoner Zero.

Jeff's second scene or so, I forget exactly when, but I believe it's before the doctor 'Borrows' the truck. I think he borrows a truck, been a while since I saw it, but he did have a way of getting into the hospital, so...

The first scene is before they meet Rory, right? What exactly happened in that scene, by the way? I know Jeff hacked into the scientists' conference but that was the second scene, wasn't it?

Yes, that was before they met Rory; IIRC Rory was at the hospital still then.

And I can't remember exactly what; but I do know it introduced the whole 'He's the raggedy Doctor!' thing. =P

Second scene was when he hacked into the conference. because the purpose of that was for the 'Zero' virus.

Geez, I forgot Jeff even existed. I saw all you guys talking about him and had no clue what was going on.

I'm ashamed of myself.

It's okay; I bet a lot of people did. He likely got eaten by a crack after The Eleventh Hour. =P