There’s only one “i” in Team Prison, but plenty of “i”s in the episode titles for The Walking Dead Season 4. Episode 2 was "Infected." Tonight's Episode 3 is "Isolation." Episode 4 is "Indifference." Episode 5 is "Internment." Icy!

This Sunday’s October 27 Episode 3 was written by none other than comic book writer/executive producer Robert Kirkman. Andrew Lincoln (Rick Grimes) told Yahoo it’s "an extraordinary episode for so many reasons." (More on that below.)

Here’s the official synopsis for "Isolation": "A group leaves the prison to search for supplies; the remaining members of the group deal with recent losses."

Recent losses, as in Hershel’s (Scott Wilson) speech from the big Comic-Con trailer about losing 12 of their own, “two of them in cold blood”? That trailer, which only included footage from maybe the first four or five episodes, also shows Tyreese saying they have to find out who did this, with Rick replying "They're not going anywhere, we'll find 'em."

The synopsis’ mention of a supply run makes us think of the car trip in the trailer, showing Tyreese (Chad Coleman)Daryl Dixon (Norman Reedus)Michonne (Danai Gurira), and new guy Bob Stookey (Larry Gilliard Jr.) driving into a major herd. (See sneak peek video below.) We'll probably see that herd attack in Episode 3, especially since it’s suggested that this is the “best” episode for Tyreese. Could it be because we’ll see him hammer down a herd of walkers? He'll be grieving for Karen, but another sneak peek (see below) also suggests his sister Sasha is sick and put in isolation with the other sick people. So Tyreese is losing everything.

The Comic-Con trailer also shows Daryl in the woods with Michonne and Bob, which is probably from the same supply trip. We also see all four of them in what looks like a school or some other building, which may be tied to their supply run. If we don’t see all of that on Episode 3, they could be saving it for Episode 4, "Indifference," which has this synopsis: “The supply mission faces hurdles; the situation at the prison worsens.”

Speaking still of Episode 3, though, Andy shared a couple of teases with Yahoo, first referencing a scene in Episode 2 when Carl (Chandler Riggs) is given back his gun. “This [new] threat is so deadly, and it's a heartbreaking moment, because [Rick’s] been renouncing the gun. And it's been working. You will certainly see in Episode 3 a man very much forced back into the middle of things.”

Andy ended a separate question, asking about the location of The Governor (David Morrissey), with this tease. "You wait. Just wait, because it just keeps building, and building, and building, and building. Episode 3's an extraordinary episode for so many reasons.” It’s tempting to read a Governor tease into that quote, but he might’ve just been speaking generally. Read the full interview to see if you get a different read.

Are you glad the action seems to be picking up, with Rick going back into a semi-leadership role?

UPDATE: Here's an intriguing new tease from SpoilerTV's source: "I'm not going to tell you who killed Karen and David (even though I know), but I will say that you will get a strong hint of it by the middle of this week's episode on AMC. And it's confirmed by the very end of the episode this week who did it. As for the the rats, that's something/someone else ie not the person who killed Karen and David."

Oooh. We're guessing Dr. S. for the Karen/David killings, unless it is Bob Stookey. We've been thinking Bob might be a spy for The Governor, because of their comic book connection. Maybe that's still true, maybe not. But it feels too obvious to make him the killer (especially since the cast and producers are all acknowledging the idea that he's mysterious and could be a spy). He could still be responsible for the rats (unless that was young Lizzie) but Bob might just be the red herring at this point. We know Bob only recently showed up at the prison, so we're still suspicious of his past connections, but when did this Dr. S. guy show up? Who is he? Are he and Bob both in cahoots with The Governor? We're seeing shadows everywhere!

Want to jump ahead? Here are the basics on next week's Episode 4, "Indifference."