The Chief announces to the residents that a solo surgery will be awarded, and the news sends them into a competitive frenzy. Meanwhile Derek turns to Bailey for advice when he feels Cristina is interfering in his relationship with Meredith, and Erica discovers a shocking connection between one of her surgical residents and a longtime patient.

Meredith, Cristina and Bailey come to Lexie and Sadie's rescue when a routine surgery goes horribly wrong, as Owen and Derek treat a man seriously injured while sleepwalking and Mark comforts the sleepwalker's distraught daughter.