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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 13. Sep, 2010- 4 - 2Double Identity 20. Sep, 2010
- 4 - 3The Undergraduates 27. Sep, 2010
- 4 - 4Touch of Eva 04. Oct, 2010
- 4 - 5Goodbye, Columbia 11. Oct, 2010
- 4 - 6Easy J 25. Oct, 2010
- 4 - 7War at the Roses 01. Nov, 2010
- 4 - 8Juliet Doesn’t Live Here Anymore 08. Nov, 2010
- 4 - 9The Witches of Bushwick 15. Nov, 2010
- 4 - 10Gaslit 29. Nov, 2010
- 4 - 11The Townie 06. Dec, 2010
- 4 - 12The Kids Are Not Alright 24. Jan, 2011
- 4 - 13Damien Darko 31. Jan, 2011
- 4 - 14Panic Roommate 07. Feb, 2011
- 4 - 15It-Girl Happened One Night 14. Feb, 2011
- 4 - 16While You Weren't Sleeping 21. Feb, 2011
- 4 - 17Empire of the Son 28. Feb, 2011
- 4 - 18The Kids Stay in the Picture 18. Apr, 2011
- 4 - 19Petty in Pink 25. Apr, 2011
- 4 - 20The Princesses and the Frog 02. May, 2011
- 4 - 21Shattered Bass 09. May, 2011
- 4 - 22The Wrong Goodbye 16. May, 2011
