Serena has gone missing; Chuck and Blair make a promise to each other about their relationship. ...

When Gossip Girl goes after Blair as she's never done before, Serena admits she may have unintentionally played an important role in Blair's latest nightmare. Meanwhile, ...

Serena poses as Blair at an important meeting. Ivy and Lola (ELLA RAE PECK) team up to help Chuck. Nate makes a decision about the future and Diana (ELIZABETH HURLEY). ...

On the anniversary of Bart Bass' death, Chuck wrestles with the dilemma of following his conscience, or that of his father. Serena begins to suspect in Trip, when thank N ...

Jenny discovers that Vanessa has been dating Nate in secret, sparking a feud between the girls. Jenny turns to Nelly, Hazel, Penelope, and the rest of Blair posse of 'mea ...

As Thanksgiving draws near, Blair looks forward to spending the holiday with her family. But her disappointment only begins when her father, Harold, is delayed in trying ...

Blair is against the idea of her mother, Eleanor, with a new man in her life, named Cyrus Rose, and she in her natural and evil ways, does everything in her power to make ...

Serena invites Aaron to be her guest at a charity gala honoring Lily and Bart, but after discovering a secret that Aaron has been keeping from her, Serena begins to quest ...

Vanessa begins her own slide on a dark path when she tries to blackmail Blair into being a nicer person, with the photos she took of Catherine and Marcus. Blair then seek ...

As Gossip Girl narrates the so-called Fashion Week where the students of the Upper East Side gather for the annual fund raiser, Blair becomes angry with her mother when s ...

Blair takes matters into her own hands to help Serena deal with the manipulative and evil Georgina Sparks who threatens to expose Serena's secret. Lily, while keeping Ruf ...

Serena falls back into her old habits of drinking and drugs. She eventually reveals to Blair true reason why she left Manhattan: to avoid being implicated in an accidenta ...

Spring Break is over, and so are all of Blair's days of hiding away. Finally, after three weeks, she comes back to school, with an unpleasant welcome by Jenny and the in ...

Serena, Blair, Nate, Chuck and their entourage break into the school swimming pool for a night of fun, but when a member of their group nearly drowns, the school threaten ...

Blair's estranged father, Harold, comes home for the Christmas holidays with an unexpected guest: his gay lover Roman. Both Blair and her mother, Eleanor, find it difficu ...

Serena and Dan finally acknowledge they are crazy about each other; Jenny discovers a secret about her parents; Blair is once again devastated by Nate's actions. ...

Dan's childhood pal Vanessa returns to town and tells him she wants to be more than friends; Blair does her best to keep party crashers out of the masquerade ball, but a ...

As the teens prepare for Ivy League college representatives to visit their campuses, Blair uncovers a secret about Serena; Dan sets his sights on impressing the Dartmouth ...

In the wake of the scandalous Kiss on the Lips party, Serena receives an icy cold reception from Blair. ...

Washington D.C. is invaded by UFOs, and Hynek and Quinn must uncover the true nature of the threat before it's too late. ...

Hynek and Quinn are unable to escape one case when a man and his wife visit the Blue Book headquarters with a story about his abduction, which they reveal after they take ...

Hynek and Quinn investigate a film documenting an Army platoon under UFO attack, and find the soldiers not only suffer from the physical effects of war, but psychological ...

After mysterious green fireballs nearly cause nuclear disaster during a weapons test, Hynek and Quinn investigate how it could have occurred. ...

A series of strange clues lead Hynek and Quinn to a secret group who claim to have witnessed strange lights during combat, and a way to contact them. ...

When the citizens of Lubbock, Texas, witness a mysterious V-shaped craft in the night sky, Hynek and Quinn are brought in to investigate. ...

Allen and Quinn investigate a West Virginia case of a woman and her two children who witnessed a UFO crash near their farm and an alien being emerge from the fiery wreck. ...

Ohio State astrophysicist Dr. Allen Hynek is recruited by the Air Force into their top-secret program investigating UFOs called Project Blue Book. ...

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