Walter recalls his experiments in the 1980s as he tries to map out Peter’s improbable biography for Olivia. Orla Brady guest stars as Peter’s mother.

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When the sole survivor of a building demolished by an earthquake in downtown Manhattan proves to be from the other Earth, Walter leads the team to Jacksonville, the source of a related experiment that he and William conducted years ago. Now only Olivia and the secrets of her past can prevent another catastrophe.

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Bryce begins his search for the woman in his flashforward, Aaron becomes concerned over Tracy’s odd behavior, Mark attempts to track down the person responsible for texting Olivia and outing his drinking during his flashforward vision, and Demetri’s co-agents try to find the mysterious caller who forewarned him about his unfortunate fate

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Not satisfied with just being Queen of Constance Billard, Jenny sets her sights on becoming the Queen of all the Upper East Side by landing the hottest escort for Cotillion. Nate and Chuck plot to help Serena and Blair repair their damaged friendship. Dan is upset when Olivia contemplates leaving school for a movie project.

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Olivia, as a guest on Jimmy Fallon’s talk show, says something she regrets and tries to hide it from Dan. With elections coming up, Nate suspects his grandfather will do everything he has to get Trip into congress. After another fight with Serena, Blair gets a new friend and takes her to an election night party at Chuck’s hotel, just to make Serena jealous.

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Mark, Demetri, and Wedeck try to link the attack on Janis to an attack on them; Olivia confronts Mark about his flash-forward; Demetri and Gough track a clue that was foreshadowed in Mark’s flash-forward; Lloyd’s son Dylan goes missing from the hospital; Simon contacts a reluctant acquaintance.

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Looking for publicity for his new hotel, Chuck moves his club’s opening and convinces Serena to assist him in getting the word out. Feeling left out, Blair tries to win Chuck’s approval by secretly helping him with a problem concerning the opening night. Meanwhile, Dan get’s nervous after watching one of Olivia’s infamous sex scenes with her co-star and real-life boyfriend during that time, Patrick Robinson. Jenny is forced to choose between Eric and her new role as Queen Bee, which as a result causes major conflict between the two characters.

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Vanessa, in an attempt to win her mother’s approval, tries to win the honor of giving the freshman toast at NYU but must square off against Blair in order to do so. Meanwhile, Dan invites Olivia to meet Rufus and Lily, which causes problems for the couple. Serena and Nate work together to help Carter.

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During the first day of school at Constance Billard, Jenny takes her place as the new Queen Bee. However, Blair gets in her way. Lily returns home to find that things are not as they were when she left them with Rufus. At NYU, Olivia Burke, an actress, enrolls and is assigned to be Vanessa’s roommate.

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Fracture – Peter, Walter, Olivia, and Broyles pursue a strange and deadly occurrence in Philadelphia where a bomb blew up inside a train station but left no trace of any explosive device. The perplexing and unexplained set of circumstances returns Walter to the lab to closely examine the human remains where he uncovers an unlikely energy source that triggered the explosion. With the explosive threat of more bombs and links to a classified military project, the intense investigation leads Olivia and Peter to Iraq.

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