Setting the stage for the dramatic and revealing first season finale are a sudden and unexpected attack on someone with close ties to Fringe Division, the return of bioterrorist David Robert Jones (guest star JARED HARRIS) and the inexplicable disappearance of Walter. Find out more about the mysterious events surrounding our trio when questions are answered, observations made, loyalties are tested and the elusive William Bell (guest star LEONARD NIMOY) is finally introduced.

首季《F檔案》來到最終回！本集劇情高潮迭起，精彩內容包括：一個與Fringe Division有緊密聯繫的人突然遇襲、生物恐怖份子David Robert Jones（Jared Harris飾演）回歸、Walter莫名其妙失蹤了。

除此之外，本集又有更多圍繞「鐵三角」──Olivia、Peter和Walter──發生的神秘事件陸續出現，而謎團續一解開、有人的忠誠備受考驗，而觀眾一直聞其名但未見其人的William Bell（Leonard Nimoy飾演）壓軸登場。