IT'S VALENTINE'S DAY ON "THE O.C." THURSDAY, JUNE 23, ON FOX

Sandy tries to make up for keeping Rebecca's return a secret from Kirsten by showering her with Valentine's Day gifts. Zach, Summer and Seth head to San Diego to pitch their comic book idea, and Seth is determined to use the trip to get Summer back. Julie returns from her European vacation and has decided to reconnect with Marissa. Meanwhile, Ryan wants to spend Valentine's Day with Lindsay, but her loyalty to Caleb gets in the way on the "Lonely Hearts Club" episode of THE O.C Thursday, June 23 (9:00-10:00 PM ET/PT) on FOX. (OC-212) (TV-TBA)

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, Melinda Clarke as Julie Cooper, and Alan Dale as Caleb Nichol.

Guest Cast: Olivia Wilde as Alex; Michael Cassidy as Zach; Shannon Lucio as Lindsay; Barry Newman as Professor Bloom and Kim Delaney as Rebecca.