THE SnO.C.: Winter hits the OC and it comes hard and fast. Sandy finds out about some of Caleb's indiscretions. Seth's having trouble dealing with Summer and Zack while DJ thinks Marissa's ashamed of him. THE CHRISMUKKAH SHOW: Seth's favourite holiday is potentially ruined by a Cohen/Nichol's family revelation but Summer and co. pull through to save Chrismukkah. Julie and Jimmy are trying to keep their rekindled passion a secret especially from Marissa. FAMILY TIES: Marissa finds out and Jimmy announces his solution to the confusion. Ryan and Lindsay try to figure out if they're related while Seth tries to "bad boy" it up for Alex. THE POWER OF LOVE: Sandy forgets their 20th and Kiersten knows it. Seth and Ryan break the rules and state troopers get involved. With Alex's help, however, the anniversary turns out better than expected.