John O'Brien

Aria has suspicions about Mike's growing friendship with Noel; Ezra gets help from an unexpected source; Toby experiences an unpleasant return to school; Emily and Maya share a final romantic night together.

Cristina treats a former Seattle Grace scrub nurse and is forever changed. Izzie's past comes back to haunt her and makes a case difficult.

Bailey interferes in Meredith and Derek's relationship. Alex works hard to gain the trust of a shy patient with a gargantuan tumour.

Meredith fights to keep her emotions in check when a secret about her mother is revealed; Alex and Izzie grow close.

Spencer learns a secret when her mother takes on Garrett as a client; Emily gets news about her English exam; Aria keeps tabs on Jenna by becoming her accompanist; Hanna reaches out to Lucas.

Jonah is assigned to work in the gun section and refuses to sell to anyone he deems suspicious. Glenn tries to buy the store's entire stock of morning-after pills.