A serial rapist sends a letter to the squad announcing his return to Philadelphia after five years and his plan to strike again.
While explaining Peter's otherworldly origins to Olivia, Walter flashes back to 1985; Peter's mother is introduced.
Raylan takes time away from his body-guarding assignment to track down an old lead; Boyd begins his mission to bring religion to the backwoods.
A disgruntled farmer threatens the nation's capital during a political protest; Loker must act as a baby sitter when a 3rd-grade field trip gets stuck in the Lightman offices.
In an attempt to recall his plan to defeat the Observers, Walter takes an LSD trip down memory lane in search of answers. Meanwhile, Peter and Olivia trace a mysterious signal into the woods, where they come upon a grisly scene.
