Survivor count: 39,665

This episode is the mid-season finale, similar to those from seasons 2 and 3. However, this break, or at least its length, is likely due in part to the writer's strike, which left only one of the subsequent episodes produced by the time this episode aired.

The identities of Tigh, Tyrol, Tory, and Anders as Cylons are revealed to the fleet.

According to D'Anna, it seems that the fifth member of the Final Five is not in the human fleet.

Tory: You had no idea, did you?
Roslin: No.
Tory: Might be worth pondering what else you've been wrong about.
Roslin: Tory, wait. You're right. I'm wrong. Okay? You are one of the revered Final Five, and as such the Cylons will listen to you. (to a Six) Is that not right?
(the Six nods)
Roslin: So, Tory, please, go to D'Anna and try to convince her to back down and release all the hostages.
Tory: I'm done taking orders from you.

Adama: I'm looking for options. You got one?
Tigh: I should have told you when I first found out, but I didn't have the guts.
Adama: What's wrong with you, Saul?
Tigh: Remember back at the nebula when I told you about that frakking music? I thought it was in the ship. I was wrong. It was a signal. Some kind of crazy, frakked-up Cylon signal. Switched me on. I can't turn it off.
Adama: Switched you on.
Tigh: Like Boomer. I'm one of the Five.
Adama: One of the Five.
Tigh: One of the Five D'Anna's after.
Adama: Quit frakking with me. Colonel, I've known you for 30 years.
Tigh: I told you. I didn't find out until the nebula.
Adama: Think about this. When I met you, you had hair. I never heard of a Cylon aging.
Tigh: Doesn't mean they don't. Before the attack on the Colonies, we didn't know skinjobs existed. Turns out there's another kind of Cylon we didn't know about, and I'm one of them.
Adama: On New Caprica, you were in captivity. They did something to you. They - an implant, a post-hypnotic suggestion that makes you feel this way. Let's go talk to Doc Cottle.
Tigh: Listen to me! It is not a delusion. It is not a chip in my head. I am a Cylon. I fooled you for months now. I didn't want to, but I did.
Adama: Get your hands off me.
Tigh: If I had the guts to airlock myself when I first found out, we wouldn't be in this mess. But that's the way out. Not this suicidal attack. I am one of the Final Five. D'Anna will back down if you threaten to flush me out an airlock.

D'Anna: So you're all in agreement this is the way to Earth?
Tigh: It's a stretch, but it's the best explanation we got.
Lee: Which is why we choose to share this information with you. We could've jumped away with it, left you behind, but that would have lead to another confrontation, another standoff.
D'Anna: All this has happened before --
Lee: But it doesn't have to happen again. Not if we make up our minds to change. Take a different path. Right here, right now. You were afraid we'd kill these four. And yet, here they are, standing right behind you. Free to go. Or stay. I've granted them an amnesty. So the question is: where do we go from here?

Adama: You guys just gonna sit here flapping your lips or are we going to go find Earth?
Lee: Kara and I have been working on a recon --
Adama: Frak it. This is the end of the line. We got nowhere else to go. And if we give the alliance too much time, it'll fall apart again. Gotta roll the hard six. We all go together. As fast as we can.
Lee: Yes, sir.

Adama: Crew of Galactica, people of the fleet, this is Admiral Adama. Three years ago I promised to lead you to a new home. We've endured a difficult journey, we've all lost, we've all suffered, and the truth is I questioned whether this day would ever come. But today, our journey is at an end. We have arrived... at Earth.