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Georgina is enlisted by the Upper East Siders as the mystery over Serena's new beau Gabriel intensifies. As does Chuck and Nate's rivalry over Blair.
Georgina Sparks makes an unexpected return, while Serena's relationship with Gabriel becomes increasingly complicated.
It's a war for the Waldorf between Blair and Nate, while Serena's new beau seems shadier by the minute and a newly-reformed Georgina returns to the Upper East Side.
Jenny's 16th birthday party gets out of hand fast, while Vanessa and Chuck hatch a plan to make Blair and Nate jealous.
Blair turns her life upside down. Chuck decides to fight for her, but it may be too late. Nate decides to forgive his family. Lily and Rufus make lists of past lovers.
Nate turns to Blair after Vanessa flirts with another guy. Chuck digs into Bart's past. Lily and Rufus question their relationship.
It's on like Donkey Kong as Blair declares war on Rachel Carr. Elsewhere, Chuck wonders where the heck he was the night before.
Nate and Vanessa get romantic, while Chuck continues to battle Jack, and Blair gets vengeful after being given the first B of her academic career.
As Bart's will is about to be read, Chuck's uncle Jack presents himself as the villain - what happened between Jack and Blair, and will it happen again?
In the aftermath of Bart's death, Chuck's downward spiral continues with drunken debauchery in Thailand. Back in New York, it's up to his uncle, Jack Bass, to get him straightened out.
