Isolation

"Isolation" is the third episode of the fourth season of AMC's The Walking Dead. It is the thirty-eighth episode of the series overall. It premiered on October 27, 2013. It was written by Robert Kirkman and directed by Daniel Sackheim.

Plot
As one group leaves the prison in search for supplies at a local college, those who stay must deal with recent losses while preserving what remains.

Co-Stars
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 * Sherry Richards as Jeanette

Uncredited

 * Tinsley and Anniston Price as Judith Grimes
 * Randy Woods as Mr. Jacobson
 * Brandon Carroll as David
 * James Michael Keats as Henry
 * Corey Reitz as "Noris' Son"
 * Sarah Wayne Callies as Lori Grimes (Photograph)
 * Erin Hunter as "Crying Mom"
 * Will Martin as "Sick Teenager"
 * Becky Shaw as the "Achey Woman"
 * Denny Ainsworth as "Woodbury Resident"
 * Bill Vella as "Woodbury Resident"
 * Deanna Dixon as "Woodbury Resident"
 * Debra Harper Bentley as "Woodbury Refugee"
 * Wallace Krebs as "Prison Resident"
 * Debra Svitil as "Prison Resident"
 * Cory Robertson as "Prison Resident"
 * Evelyn Elliott as "Prison Resident"
 * Sarah Wildman as "Prison Resident"
 * John Jaret, Jeff Matthew Glover, Christopher Kelly & Shellita Boxie as Walkers
 * Taylor McPherson as Thomas (Filming Error)
 * }
 * }

Deaths

 * At least 2 unnamed Prison residents

Trivia

 * The title of the episode, "Isolation", refers to the isolation of the survivors infected with the flu from the presumed uninfected young and old.
 * The herd featured in this episode is the largest within the entire The Walking Dead media, including over 7,500 walkers.
 * In a behind-the-scenes video on the AMC website, the VFX Supervisor mentions that they turned 100 real Zombie Extras into about 10,000.
 * Carl is using the backpack that he, Rick and Michonne took from the Hitchhiker in "Clear".
 * This episode marks the first time we have seen Carol leave the prison since the group's arrival in "Seed".
 * The radio transmission is the first reference to Terminus. The next reference to it will be several episodes later, in "Inmates".

Comic Parallels

 * Rick and Tyreese's fight is adapted from Issue 23.
 * Rick looking at his injured hand at the end of the fight is adapted from a similar scene in Issue 17, where he looks at it after beating Thomas instead.
 * Hershel stitching and cleaning Rick's hand is adapted from a similar scene in Issue 18, where Dale stitches and cleans it instead.
 * Rick investigating the murders is adapted from Issue 18.
 * Tyreese fighting the herd on the side of the road is adapted from a similar scene in Issue 15, where he fights a group of walkers in the prison's gym instead.