Jenni Blong

While explaining Peter's otherworldly origins to Olivia, Walter flashes back to 1985; Peter's mother is introduced.

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.

A serial rapist sends a letter to the squad announcing his return to Philadelphia after five years and his plan to strike again.

Seeking more answers about her past, Sookie enlists Lafayette to summon her dead parents. Meanwhile, Eric and Tara resort to drastic measures when Pam finds herself in dangerous territory. Sarah Newlin reconnects with Jason as Jessica seeks atonement.

When a girl's ghost befriends Aiden and threatens Melinda to stay out of her way, Melinda worries for her son's safety.

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.