Little bit of info about her up-coming return to The OC. (possible spolier maybe-just a warning!)
If you think the course of Seth and Summer's true love will continue along smoothly, you've clearly forgotten how things are done on The O.C. In an attempt to "r*tchet up" the angst for the young lovers who seem like old marrieds, series creator Josh Schwartz is bringing back their biggest speed bump ever: Seth's one-time love interest, Anna, played by Samaire Armstrong.
"She returns when there's a little bit of emotional upheaval for Seth as he prepares to go away to college," Schwartz says of the pixie's multiepisode arc, which kicks off at the end of April. "Based on all this anxiety, Seth really needs a stabilizing force. But Anna's timing is inopportune if you're Summer."
(from samairearmstrong.net)