PA: Due to some violent content, parental discretion is advised.

MARISSA ATTENDS NEWPORT UNION ON "THE O.C." THURSDAY, SEPTEMBER 29, ON FOX

Marissa adjusts to life in her new surroundings and makes some new friends at Newport Union, while Ryan wonders how their separation will affect their relationship. Seth's feud with the Dean lands Summer in hot water, but some startling new information about Taylor may turn the tables once more. Meanwhile, Kirsten's friend Charlotte lands in Newport with some big ideas, while Sandy mulls over the future of the Newport Group. Meanwhile, Julie Cooper may no longer be a Newport Beach socialite on "The Last Waltz" episode of THE O.C. Thursday, Sept. 29 (8:00-9:00 PM ET/PT) on FOX. (OC-304) (TV-PG 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, and Melinda Clarke as Julie Cooper.

Guest Cast: Jeri Ryan as Charlotte Morgan, Eric Mabius as Dean Hess, Autumn Reeser as Taylor, Kayla Ewell as Casey, Ryan Donowho as Johnny, Johnny Lewis as Chili, and Rich Voll as Glen.