The O.C. - Season 2 - Eps 19: The Rager
It's Trey's 21st birthday and Marissa, anxious to help Trey and Ryan forge a relationship, throws a birthday party for Trey at the Cooper-Nichol mansion that turns out to be a rager. Seth is left in hot water by both Summer and Zach, but why? Sandy wants to continue his friendship with Carter, leaving a confused Kirsten. Meanwhile, Julie shares some memories with an "old" friend and in the process learns a few things and gains a few ideas.
About The O.C.

Title: The O.C.
First Air Date: 2003-08-05
Last Air Date: 2007-02-22
Status: Ended
Rating: 7.8/10 (from 852 votes)
Language: EN
Seasons: 5
Total Episodes: 92
Network: FOX
Genres: Drama
Production Companies: Warner Bros. Television, Wonderland Sound and Vision, Fake Empire Productions
Synopsis
Ryan Atwood, a teen from the wrong side of the tracks, moves in with a wealthy family willing to give him a chance. But Ryan's arrival disturbs the status quo of the affluent, privileged community of Newport Beach, California.
Cast

Peter Gallagher
Sandy Cohen

Kelly Rowan
Kirsten Cohen

Ben McKenzie
Ryan Atwood

Adam Brody
Seth Cohen

Melinda Clarke
Julie Cooper

Rachel Bilson
Summer Roberts

Autumn Reeser
Taylor Townsend

Willa Holland
Kaitlin Cooper