THE GANG GRADUATES ON "THE O.C." THURSDAY, MAY 18, ON FOX

The end of senior year is finally here, bringing the excitement of graduation and the anticipation of new lives in college and beyond. But for Seth, Ryan, Marissa and Summer, it's also a time to look back on the amazing journey that has brought the four of them this far. Seth must confront his recent misdeeds or deal with the wrath of Sandy - and the police. Ryan's proud mom arrives with a surprise for him. Marissa receives an astounding proposal that may radically change her plans. And Summer, facing the prospect of going away without Seth, can't stop crying and hugging her best friends as they say their farewells. But amidst the speeches and toasts, nothing is ever simple in Newport. Sandy shocks Kirsten by making a big decision after visiting his old Public Defender's office. Kaitlin returns and moves into Julie's home, vowing to become the next Cooper to rule Harbor High. And to Taylor's joy, the "core four" turns into the "fab five." However, although the kids may be ready to move on to bright futures, unresolved issues from their past could ruin everything on "The Graduates" episode of THE O.C. airing Thursday, May 18 (9:00-10:00 PM ET/PT) on FOX. (OC-325) (TV-14 D, L)

Cast: Peter Gallagher as Sandy Cohen, Benjamin McKenzie as Ryan Atwood, Adam Brody as Seth Cohen, Melinda Clarke as Julie Cooper, Mischa Barton as Marissa Cooper, Kelly Rowan as Kirsten Cohen, and Rachel Bilson as Summer Roberts.

Guest Cast: Michael Nouri as Dr. Roberts, Cam Gigandet as Volchok, Autumn Reeser as Taylor, Willa Holland as Kaitlin, Lamont Thompson as D.A. Hodes, Daphne Ashbrook as Dawn, Rosalind Chao as Dr. Kim, Jose Zuniga as Jason Spitz, and Paula Trickey as Veronica Townsend.