Addison, Naomi and Sam rush Archer to Seattle Grace, where they reunite with old friends in hope of saving his life; Izzie devises a medical game to teach the interns; Owen runs into someone significant from his past.

Jailed drug dealer Lemond Bishop requests that Alicia work with lawyer Charles Lester, but as witnesses against Bishop begin recanting their testimony, she begins to suspect that Lester's meek appearance isn't all it seems. Also, Kalinda is forced to train a new investigator and Cary makes a risky move. Audra McDonald guest stars as Alicia's law school classmate and Wallace Shawn guest stars as Lemond Bishop's other lawyer.

Naomi returns for Addison's wedding day; Cooper struggles in his role as a stay-at-home father; Violet starts a new project that has special meaning.