<P> William van der Woodsen (William Baldwin) returns, making Serena happy but is unknowingly dragged into her father's plot to win back his ex-wife . The plot nearly works until Jenny, Blair, Nate and Chuck scheme against William, who had been trying to frame Rufus for adultery and intentionally misdiagnosing Lily, and William leaves . Her father's departure leads to Dan comforting her and reignites her feelings for him . Serena sleeps over at Dan's and wake up to find themselves in a compromising position, one that Jenny photographs and sends to Gossip Girl . As the photo spreads, Nate and Serena temporarily end their relationship and she joins Blair for a summer in Paris . </P> <P> Serena is seen spending her summer in Paris with Blair, reluctant to tell Blair that she has enrolled in Columbia, something that Blair fears will have them return to their high school pettiness, when she receives news that Chuck might be dead . After an unfortunate double date involving a handsome royal, Blair eventually forgives her . Chuck's arrival and a visit to a Parisian morgue confirms that he is alive but Serena pursues him in hopes of convincing him to return to New York when he tries to run away to London . She returns to New York having made her decision between Dan and Nate but her decision becomes irrelevant when she sees them with their new respective significant others, Vanessa and Juliet Sharp (Katie Cassidy), a girl with a personal vendetta against Serena . </P> <P> Serena's enrollment in Columbia has her face Juliet's many attempts at getting rid of her, ranging from excluding her from an exclusive society along with driving Blair against her, exposing her relationship with her professor, Colin Forrester (Sam Page), who happens to be Juliet's cousin to get her kicked out, and spreading various rumors about Serena, who manages to evade these attempts . Juliet then recruits Jenny and Vanessa and succeed in gaslighting her into toying with Dan and Nate's feelings, attempting to take a foundation position from Blair, and returning to her old partying habits . Serena is rehabilitated while Dan and Blair subsequently discover Juliet's reasons for ruining Serena . Serena was supposedly in an illicit, but not ever consummated, relationship with Juliet's half - brother and Serena's boarding school English teacher, Ben Donovan (David Call) and was arrested when Lily forged an affidavit that falsely accused Ben of statutory rape, out of concern for Serena . </P> <P> The holidays has Serena trying to figure out how to release Ben from prison and her relationship with Lily is yet again strained . Serena and Dan put a possible return to their relationship on hold, knowing that they might not have the same chance of loving and trusting each other . Meanwhile, Ben's release from prison reignites Serena's feelings for him and they pursue a loving, yet troubled relationship . Serena's relationship with Ben slowly erodes when she receives news from Vanessa that he is responsible for hurting Nate's father in prison and when Ben's mother, Cynthia, raises Ben's personal troubles while at the same time seeking to exonerate him . Serena becomes proud of her mother when Lily decides to face the consequences of sending an innocent Ben to prison . Serena and Ben's relationship eventually ends due to family complications . </P>

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