Recapping episode 20 of season 2 of The O.C.. Finally adhering to a legitimate schedule, we return with guest star Billy lending his expertise on 2000s mens fashion, high school parties for cool teens, and what exactly Zach is trying to do with Summer and Seth this ep. Ryan and Marissa also play undercover cop (???) to save Trey with Sandy's blessing (also ???), while Kirsten's stock trends even further down with us from the latest Carter scenario.