When things get tense between Rufus and Will, Serena chooses to stand behind her father, leaving Rufus to feel like an outsider within his own family.
Will's return to the Upper East Side continues to stir up problems for Serena, Lily and Will's long-standing rival, Rufus.
When Lily's ex-husband shows up unexpectedly, Serena gets the reunion with her father she has so desperately wanted -- or does she?
Chuck offers to throw a wedding for a very pregnant Dorota. Serena doesn't tell Nate she is secretly meeting up with Carter Baizen.
Chuck and Blair are faced with a difficult decision as a couple. Serena plans a birthday party for Nate, but Jenny tries to sabotage Serena's efforts.
Rufus volunteers Jenny to help with Eleanor's fashion show, but things take a bad turn when Jenny learns Agnes is one of the models.
Jenny contemplates her relationship with Damian. Dan and Vanessa try to define the different "zones" of their relationship.
Rufus and Lily are suspicious of Jenny's relationship with Damien. Chuck learns more about the mysterious woman.
Chuck tracks the woman he saw at his father's grave. Jenny agrees to help Damien. Nate and Serena get friendly.
Chuck wrestles with a past issue and a serious car accident rocks the Upper East Side. Dan and Vanessa try to navigate their complicated friendship.
How about an extra serving of holiday drama? Serena is put in an awkward position when Lily invites Tripp and Maureen to join them for dinner.
Dan and Olivia sign up to write and star in a school play, based on an idea by Blair and directed by Vanessa. Lady Gaga performs.
Jenny sets her sights on landing the hottest escort for Cotillion. Dan is upset when Olivia contemplates leaving school. Plastiscine performs.
Olivia says something she regrets during an appearance on a talk show with host Jimmy Fallon and tries to keep Dan from finding out.
Serena helps Chuck open his club, but Blair feels left out. Dan is unnerved watching one of Olivia's sex scenes with a former co-star.
Dan invites Olivia to meet Rufus and Lily, which leads to all sorts of problems for the new couple. Serena and Nate team up to help Carter Baizen.