Flashback! Stars Who Stopped by The O.C.In honor of the hit show's 10th anniversary, see which soon-to-be-famous faces hit the beach with Mischa Barton, Benjamin McKenzie, Rachel Bilson and Adam Brody

CAM GIGANDET

His merciless, cold-blooded (literally!) Twilight alter ego was only topped by his 2005-2006 portrayal of the villainous (but secretly soft) Volchok, whose bad-boy antics led to the game-changing death of Cooper, the show's ongoing damsel in distress. "Most people thank me for that," he later told PEOPLE.