The Walking Dead Season 4, Episode 3, titled "Isolation," centers on a deadly flu outbreak within the prison, prompting a quarantine and a supply run by Daryl's group for antibiotics. The episode culminates in the revelation that Carol murdered Karen and David to halt the infection's spread, sparking intense conflict with Tyreese. For official, secure viewing options, check platforms like Netflix netflix.com, Disney+ disneyplus.com, or AMC+ amc.plus.