Cristina makes Owen tell her about the intimate details of his affair; Mark takes his authority very seriously when he steps in as chief for the day; Arizona, Callie and Bailey plan special night for Teddy.
Meg returns to Los Angeles and notices that Violet and Pete have grown closer; Kevin questions where he and Addison are headed as a couple; Cooper treats a young boy with a mysterious past.
Nathan tries to stop Sylar from meeting the president; Hiro discovers that there are consequences to regaining his abilities; Matt tries to protect his future with his family.
An unexpected revelation shakes Emily to the core; Victoria sinks her claws deeper into David.
An amateur magician's (Jonathan Slavin) assistant vanishes during an ambitious disappearing act; Leo asks Isabel for help finding Willa.