FAMILIES CHANGE FOREVER ON "THE O.C." THURSDAY, JANUARY 6, ON FOX

As one family strengthens, another will be changed forever. The Cohens, after Caleb's revelation, decide to try to accept Lindsay as a member of the family, while another family is heartbroken over the news that one of them is leaving Newport Beach. Meanwhile, Seth tries to be a "bad boy" like Ryan to improve his relationship with Alex on "The Family Ties" episode of THE O.C Thursday, Jan. 6 (8:00-9:00 PM ET/PT) on FOX. (OC-207) (TV-PG D, L)

Cast: Peter Gallagher as Sandy Cohen, Benjamin McKenzie as Ryan Atwood, Mischa Barton as Marissa Cooper, Rachel Bilson as Summer, Adam Brody as Seth Cohen, Kelly Rowan as Kirsten Cohen, Tate Donovan as Jimmy Cooper, Melinda Clarke as Julie Cooper, and Alan Dale as Caleb Nichol.

Guest Cast: Michael Cassidy as Zach; Olivia Wilde as Alex; Shannon Lucio as Lindsay; and Nicholas Gonzalez as D.J.