Season four’s main mystery revolves around Juliet Sharp, a secretive girl with an agenda against Serena involving her past. The second half of the season builds on the complications of Serena’s new found relationship with her former teacher Colin, Chuck trying to regain control of Bass Industries from Russell Thorpe, and Dan and Blair’s growing friendship. The season also focuses on Lily’s past betrayals coming back to haunt her; Chuck and Blair’s tumultuous relationship after their break up; Dan and Vanessa’s deteriorating friendship; and the arrival of Serena’s cousin Charlie Rhodes to the Upper East Side. By the end of the season, Blair has ignored Chuck, Dan has told Vanessa they are no longer friends, and Serena is on that single grind.
4 - 1Belles de Jour Sep. 13, 2010
4 - 2Double Identity Sep. 20, 2010
4 - 3The Undergraduates Sep. 27, 2010
4 - 4Touch of Eva Oct. 04, 2010
4 - 5Goodbye, Columbia Oct. 11, 2010
4 - 6Easy J Oct. 25, 2010
4 - 7War at the Roses Nov. 01, 2010
4 - 8Juliet Doesn’t Live Here Anymore Nov. 08, 2010
4 - 9The Witches of Bushwick Nov. 15, 2010
4 - 10Gaslit Nov. 29, 2010
4 - 11The Townie Dec. 06, 2010
4 - 12The Kids Are Not All Right Jan. 24, 2011
4 - 13Damien Darko Jan. 31, 2011
4 - 14Panic Roommate Feb. 07, 2011
4 - 15It-Girl Happened One Night Feb. 14, 2011
4 - 16While You Weren't Sleeping Feb. 21, 2011
4 - 17Empire of the Son Feb. 28, 2011
4 - 18The Kids Stay in the Picture Apr. 18, 2011
4 - 19Petty in Pink Apr. 25, 2011
4 - 20The Princesses and the Frog May. 02, 2011
4 - 21Shattered Bass May. 09, 2011
4 - 22The Wrong Goodbye May. 16, 2011