Credit: Twitter Photo: Michael Cudlitz as Abraham on Walking Dead

After the The Walking Dead Season 4 mid-season finale, Team Prison split up and hit the road, so it only makes sense that the various groups would run into other survivors in their travels.

Enter Sgt. Abraham Ford (Michael Cudlitz), Rosita Espinosa (Christian Serratos), and Dr. Eugene Porter (Josh McDermitt).

Glenn Rhee (Steven Yeun) and Tara (Alanna Masterson) came across the trio on Episode 10, “Inmates.” Comic book writer/executive producer Robert Kirkman previously told The Hollywood Reporter Abraham, Eugene and Rosita would “enter into the series with a mission” that would “change the stories that we tell because of that.” What mission?

Comic book spoilers ahead:

They never do the same thing in the books and TV, but in the comics, Rick Grimes (Andrew Lincoln) and company met Abraham, Rosita, and Eugene at Hershel’s farm, after the final prison battle. The trio were looking for supplies to take with them on their journey to Washington, D.C., since Eugene said he was a scientist with the answer to what happened and they were heading to D.C. to connect with others in the know. Rick’s group decided to go with them. What else did they have to do?

Robert Kirkman talked to Entertainment Weekly about how the TV versions of Abraham, Eugene, and Rosita would change the story. “I think the main thing to look at is that these are some very interesting and dynamic and explosive characters that will be breathing some new life into the show, which is something that all of our new characters do. They’re going to be pushing things in new directions. So they will definitely be an X factor that changes the dynamic of the show quite a bit. There’s cool things ahead with them.”

Excellent. Speaking of cool stuff, did you know that Southland’s Michael Cudlitz won his "massively important" role as Abraham over several other actors, including a “well-known actor from Once Upon a Time who very much wanted the part”? That’s the scoop from E! News. Michael was deemed “perfect” for the role of Abraham, who will "closely resemble but not mirror the books."

In the books, Abraham was a guy in his late 40s who was a U.S. Army sergeant and sports coach before the bleep hit the fan. (Here’s how he looks in the comics.) He became Rick's new BFF after the comic book death of Tyreese, but Tyreese basically had Hershel's death in the comics. He's still alive on TV, as is Rick's bromance buddy Daryl Dixon, who was never in the comics at all. So who knows where Abraham will fit in the BFF rankings. In the books, Abraham and Rosita have a romantic relationship, and that’s expected to continue on TV.

Here are two other things to keep in mind with the newbies: The synopsis for Episode 12, “Still” (March 2) reads, "An enlightening mission springs from a request from one of the group members." So it’s possible that’s when we’ll hear about Eugene’s mission, if they stick with that plot. Also, back in December, Vulture asked showrunner Scott Gimple how Abraham and Eugene would fit into the show when they arrived, and he answered, “We get to know them a little bit. They affect the characters’ stories a great deal, but we’re not going to get into their stories in a deep way until next season.” So add them to the Season 5 list. Not sure about Rosita, though, since she wasn’t added to that question.

Are you excited to see more from this dynamic trio?

The Walking Dead Season 4 airs Sundays at 9 p.m. ET on AMC.

Sources: E! News, Entertainment Weekly, Vulture