Mark gets a lead on the tattooed assassin that he saw in his flashforward. Simon and Lloyd play a game of poker to settle old scores. Aaron uncovers the harsh truth behind Tracy's death. Janis has second thoughts about her career.
Mark, Demetri, Gough and MI6 agent Fiona Banks investigate a Blue Hand club and its possible connection to some recent suicides. Meanwhile, Aaron receives a surprise visit from a former army buddy of his late daughter's, Demetri comes clean with Zoey about his lack of a flashforward, and Nicole helps Bryce uncover the mystery of his flashforward while volunteering at the hospital. In the end Aaron gives Mike (Tracy's friend) a job and comes home to find Tracy alive and safe waiting for him in his living room, and Gough commits suicide by jumping off the roof of the FBI building, having learned in his flashforward he would be responsible for an accident that would kill a young mother and leave two young boys orphaned. He leaves Demetri with the message that by killing himself when he saw himself alive it means the future can be changed and Demetri may change his future and live.
Mark, Demetri and Wedeck try to find a connection between Janis' attack and a separate attack made on them. Meanwhile, as Halloween approaches, Olivia confronts Mark about his flashforward, Demetri and Gough track down a clue that was foreshadowed in Mark's flashforward, Lloyd's son, Dylan, goes missing from the hospital, and the elusive Simon makes contact with a reluctant acquaintance.
A Senate Intelligence Committee meeting sees the details of Mark's flashforward, and possibly the entire investigation, questioned. Meanwhile, Olivia receives information from a mysterious source about Mark's vision.
Olivia struggles to accept Bryce's suggestion that a patient's flashforward holds the key to a correct diagnosis and treatment. Meanwhile, Demetri accuses Mark of waiting for the future he saw in his flashforward to come true without incident, while Mark feels Demetri is letting his fear of what he witnessed envelop his life; and Nicole returns to work as Mark and Olivia's daughter's babysitter, and discloses her shocking future vision -- involving a murder.
Mark and Janis travel to Germany to speak with an imprisoned Nazi who claims to have knowledge about the blackouts, and an anonymous tip leads Demetri to believe his deepest fears about his future. Meanwhile, Aaron pleads with Mark to help him get the approval to have his daughter's body exhumed in order to re-test her DNA and confirm the identity of the remains.
The FBI begin to acquire vital clues about the blackout. The web site they've established leads them to Utah and eventually to the conclusion that there were at at least two people awake during the blackout. Mark Benford is more convinced than ever that his wife Olivia's vision, that she will take up with another man, is inevitable after she meets the man, Lloyd Simcoe, while treating his son at the hospital. Olivia insists that she will never love anyone but him but Mark's attitude may turn the vision into a self-fulfilling prophecy. Demetri Noh gets more information about his own fate. Mark learns some frightening information from his daughter Charlie's about her blackout vision.
A seemingly normal day turns chaotic when everyone blacks out on Earth for 2 minutes, 17 seconds and can only remember seeing personal events from their own futures.
