: This story runs parallel to the main game, following a military unit called Greyhound One in the city of Danforth as they attempt to rescue high-value scientists.

: Judge Lawton leads a group of citizens under strict martial law, hoping to wait out the incursion. This group eventually falls when the courthouse is overrun by zombies.

: Led by Sergeant Erik Tan and Captain Diane Montresser , the military is present in the valley. However, the survivors soon realize the army is focused on containing the outbreak —preventing it from spreading further—rather than rescuing the people trapped inside.

: While attempting to blow up the wall, the detonator malfunctions. Sergeant Tan, revealing he is already infected, chooses to manually detonate the explosives , sacrificing himself to clear the path.

As Marcus and the others work to fortify their base and gather supplies, they encounter several other factions and enclaves:

: Re-visits Trumbull Valley years later, exploring the evolution of the virus into the Blood Plague and the fate of original characters like Lily Ritter, who eventually founds "The Network".