Jenni Blong

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

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.

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.

President Palmer tells Jack that a top CTU agent is to be killed. Meanwhile, at the hotel, Michelle offers a peaceful ending to those infected with the virus.

With Saunders now calling the shots, Jack looks to create a surprise of his own to gain the upper hand. Meanwhile, CTU is hot on the trail of a hotel guest who managed to escape.

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.