Sandy reluctantly agrees with Kirsten to serve as host/auctioneer at yet another OC benefit. Meanwhile, Trey lies to Ryan to prove that he can be self-dependent when he steals one auction exhibit leading Ryan and Seth on a mission to recover it before anyone finds out. Carter reinvigorates Seth and Zach's comic book dream, much to the annoyance of Summer. Also, Marissa moves in with the Cohens, unwilling to stand anymore of living with Julie or Caleb.