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On Z Nation Season 4 Episode 13, the secret of Warren's Black Rainbow Dream is unlocked when they reach their final destination on the season finale.
On Z Nation Season 4 Episode 12, the team must stop Zona from launching operation Black Rainbow which will cleanse the landscape of both humans and zombies.
Warren's visions lead the group back to Mercy Labs where she must perform a dangerous task without knowing why, as the the truth about black rainbow is revealed.
Doc and Murphy are reunited with old buddies Sketchy and Skeezy when they take refuge in a working barber shop, but they also find it full of mysterious, dangerous characters.
The group explores an abandoned TV news station and encounters news crew zombies, triggering haunting flashbacks from day one of the zombie apocalypse.
Warren and the crew encounter a mysterious stranger in an abandoned church who they think is a grave robber, but he's something much more than that.
Shaken by the death of one of the team, something snaps in Murphy, and Warren is unable to stop him and the others from committing an atrocity as misplaced revenge.
Lucy tries to save Murphy's life, while Warren gets closer to uncovering a clue to her dream, but she must contend with a powerful new enemy to get it.
When the team is enslaved by an unknown force, they are held in an underground facility where their captor forces them to perform a set of bizarre and dangerous tasks.
In accordance with the dream Roberta Warren had, the team journys across a seemingly endless landscape of devastation called The Great Pile.