ANNA, THERESA AND THE BABY RETURN TO "THE O.C." THURSDAY, APRIL 20, ON FOX

Graduation is just weeks away and Ryan, Seth, Summer and Marissa leave Newport to attend their respective pre-frosh orientations at UC Berkeley and Brown. While dropping the boys off at the airport, Kirsten is surprised to see Theresa and her all-too-familiar-looking baby boy. While visiting Brown, Seth runs into Anna on the quad and they instantly connect. Could this be the end of Summer and Seth? Meanwhile, Kirsten and Sandy attend a hospital benefit where Kirsten vents her frustrations and falls back into an old habit on "The College Try" episode of THE O.C. airing Thursday, April 20 (9:00-10:00 PM ET/PT) on FOX. (OC-322) (TV-TBA)

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, Samair Armstrong as Anna, Navi Rawat as Theresa, Matt Barr as Wes, and Erick Avari as Dr. Overbee.