Lost, Season 6

[Jack and The Man in Black are meeting for the first time]

Jack Shephard:
You look just like him.

The Man in Black:
Does it bother you?

Jack Shephard:
No, what bothers me is I have no idea what the hell you are.

The Man in Black:
Sure you do.

Jack Shephard:
Why John Locke?

The Man in Black:
Because he was stupid enough to believe he had been brought here for a reason. Because he pursued that belief until it got him killed. And because you were kind enough to bring his body back here in a nice little wooden box.

Jack Shephard:
And he had to be dead before you could look like him?

The Man in Black:
That's right.

Jack Shephard:
And who else have you looked like?

The Man in Black:
Jack, what do you really want to ask me?

Jack Shephard:
Our third day here, I chased my father through the jungle, my dead father. Was that you?

The Man in Black:
Yes, that was me.

Jack Shephard:
Why?

The Man in Black:
You needed to find water. Jack, I know this must be hard for you to understand, but all I've ever tried to do is help you.

Jack Shephard:
To "help me?" To do what?

The Man in Black:
Leave! But because Jacob chose you, you were trapped on this Island, before you even got here. Now Jacob's dead, we don't need to be trapped here. We can get on a plane and fly away anytime we want.

Jack Shephard:
If we could just get on a plane and fly away, why would you even still be here?

The Man in Black:
Because it has to be all of us.

[Jack still looks uncertain]

The Man in Black:
What?

Jack Shephard:
John Locke was the only one of us who ever believed in this place. He did everything he could to keep us from leaving this Island.

The Man in Black:
John Locke was not a believer, Jack. He was a sucker.