A CHRISMUKKAH BAR MITZ-VAHKKAH TO REMEMBER ON "THE O.C." THURSDAY, DECEMBER 15, ON FOX

After the gang spends hours picking out the perfect Christmas trees, they devise a special plan to help a friend in need. Meanwhile, the holidays bring out a somber Summer who misses her mom, and Johnny's sudden misfortune forces him to take matters into his own hands. Kirsten, meanwhile, puts the past behind her and reaches out to Julie Cooper. And when a reminiscing Seth vows to put a little "mukkah" into Ryan�s "chris," Ryan gets Bar-Mitz-vahkkahed on the third annual O.C. "Chrismukkah" episode, "The Chrismukkah Bar Mitz-vahkkah," on THE O.C. Thursday, Dec. 15 (8:00-9:00 PM ET/PT) on FOX. (OC-310) (TV-PG L)

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

Guest Cast: Ryan Donowho as Johnny, Michael Nouri as Dr. Roberts, Blair Hickey as the photographer, Juan Ramirez as the cashier, and Nicklaus Koeppen as Young Seth.