SEASON FINALE! 1x18 Much 'I Do' About Nothing

Blair takes matters into her own hands to help Serena with the manipulative and evil Georgina Sparks. Lily, while keeping Rufus in her mind, prepares for her wedding with Bart Bass that is designed to be the Upper East Side's social event of the year. Serena finally tells Dan the whole truth about her past and they try to work things out after Dan has cheated on her, will it be too late? An unexpected guest shows up at Lily and Bart's wedding. Georgina goes somewhere where she can do no harm. Blair plans to go somewhere with Chuck.

1x00 Gossip Girl Revealed

The CW Network invites die-hard fans and new viewers to catch the hit freshman drama Gossip Girl from the very beginning with a special, 90-minute Gossip Girl Revealed, hosted by the stars of Gossip Girl and featuring the series premiere as well as exclusive, never-before-seen bonus material. In addition to airing the pilot episode in its entirety, The CW will offer an enhanced Gossip Girl experience to passionate devotees and the uninitiated wanting to see how the phenomenon began. During the broadcast, viewers will go behind the scenes for in-depth conversations with TV's hottest cast. Additional bonus material includes never-before-seen footage from the series, profiles of the players and the wannabes in the Gossip Girl world, featurettes on the Gossip Girl fashion and music, and much more.

1x17 Woman On the Verge

Serena slips back into her old habits because she is ashamed of her secret. She eventually reveals it and her friends Blair, Nate and Chuck have to put their differences aside, in order to help her. Unfortunately, Serena is too ashamed to share the truth with Dan, therefore he assumes the worse about his girlfriend.

Meanwhile, Rufus is excited when his band is invited to perform at a Rolling Stone-sponsored concert, but Lily is the last person on earth he expects to see at the performance, especially since her wedding rehearsal dinner is the same night.

1x16 All About My Brother

Georgina informs Serena that she can reveal a deep dark secret from Serena's past, but no one is prepared for what Georgina does next. Blair and Jenny's power struggle continues when each of them start spreading scandalous rumors about each other on Gossip Girl. Dan sees Jenny's new beau, Asher, cheating on her, but Jenny doesn't believe him. Rufus goes to Lily for advice on how to handle Jenny's new behavior. Serena tries to confront Georgina, but she leaves before Serena has a chance. After this Serena says that she and Georgina are not friends.

1x15 Desperately Seeking Serena

It's SAT time, and Georgina Sparks (Michelle Trachtenberg), Serena's former partner in all things bad, returns to Manhattan. They go out to a bar one night and things go haywire. The next night, they decide to have a one hour dinner, no alcohol. However, Georgina spikes Serena's drink, and she ends up missing another study night with Dan. Nate finds romance with Vanessa, the last person he would expect. Jenny meets a guy who could be her ticket to permanent popularity, but Rufus on the other hand, grounds her for the Valentino incident. Dan and Blair discover Vanessa and Nate are spending time together.

Meanwhile Blair is trying to bring down Nelly Yuki, one of the smartest girls at Constance, so that she will wipe out the competition for Yale. She does so by keeping Nelly off focus by having her ex-boyfriend mess with her feelings so that she will screw up her SAT's.

1x14 The Blair Bitch Project

Blair hesitantly returns to school after being dethroned as Queen Bee. Serena struggles to adjust to living with her future stepbrother, Chuck, and receives disturbing packages from an unknown sender. Jenny's drive to be popular hits a high. Her birthday is coming up, and she feels too ashamed of being middle-class so she steal's Hazel's mother's red Valentino dress.

1x13 The Thin Line Between Chuck and Nate

Gossip Girl takes pleasure in reporting that Serena van der Woodsen has been spotted buying a pregnancy test, and the word spreads like wildfire.

1x12 School Lies

The gang breaks into the school swimming pool for an impromptu night of fun, but when a member of their group nearly drowns, the school threatens to expel the person responsible for the break-in. That person is none other than......

1x11 Roman Holiday

When Blair’s father, Harold (recurring guest star John Shea, comes home for the holidays with an unexpected guest -- his boyfriend, Roman (guest star William Abadie - "Entourage," "The O.C.," "The Pink Panther") -- Blair finds it difficult to hide her disappointment and hatches a plan to get rid of Roman for good.

1x10 Hi, Society

Serena has absolutely no intention of attending the upcoming Debutante Ball, until her grandmother, CeCe (guest star Caroline Lagerfelt - "All the King's Men," "Nash Bridges"), announces that Serena must attend.

1x09 Blair Waldorf Must Pie!

When Dan finds out that Serena and her family are celebrating Thanksgiving alone, he naïvely invites them to spend the holiday with his family, creating an uncomfortable situation for Rufus and Lily.

1x08 Seventeen Candles

Although Blair is devastated by the state of her relationship with Nate, she manages to put on a happy face for her 17th birthday party and attempts to hide her feeling from her friends. Hoping to ease the tension between Serena and Vanessa, Dan takes Vanessa to Blair's party so the girls can "bond" together, but this ends up making Serena more uncomfortable, but they end up finding common ground. Jenny brings Allison home for a surprise visit, but neither Dan or Rufus is ready to forgive and forget. Nate's parents ask him to make a huge sacrifice to save his father's business as he faces charges of embezzlement and fraud. Thinking that Nate is giving her a diamond necklace for her birthday, Blair couldn't be happier. Until, she finds out at the party, that Nate doesn't show up and the present turns out to be from Chuck.

1x07 Victor/Victrola

After surviving the on-again/off-again nature of their new relationship, Serena and Dan finally acknowledge they are crazy about each other, despite their polar opposite worlds that constantly threaten to pull them apart. Dan tries to treat Serena to a romantic evening alone. Chuck contemplates investing in a burlesque club in the hopes of making his father proud of him, only to confuse his father's and Lily's relationship and making Lily's and Rufus' relationship go further. Nate confronts his father about the cocaine he found in the house, but his father denies having a problem. Jenny discovers a secret her father, Rufus, and mother, Alison, have been keeping from her. Finally, Blair is once again devastated by Nate's actions after Jenny reveals that Nate kissed her by accident thinking she was Serena. After Blair confronts Nate about Jenny's confession, she breaks up with Nate as her relationship with Chuck heats up, and she loses her virginity to Chuck.

1x06 The Handmaiden's Tale

Dan is torn between two girls when his childhood friend, Vanessa (recurring guest star Jessica Szohr), returns home and declares her feelings for him, just as he and Serena are trying to figure out what they mean to each other. Blair is having a masquerade party, where Nate must find her by midnight for them to consume their love for one another. Vanessa and Jenny sneak into Blair's party, and Serena gives Jenny some of her outfit - with her face hidden, she can be mistaken for Serena, which Nate does mistake her for, and kisses her, thinking Jenny is Serena. Nate does not find Blair in time.