Billy Malone

A series of drive-by murders occur after six wrongly convicted men are released from prison, making Danny and Baez wonder if the murders were orchestrated by the men as an act of revenge. Meanwhile, Frank fights feelings of guilt.

The community is up in arms over the police shooting of a man who was unarmed. The public backlash forces Mac and the team to hurry their investigation along to solve the case as soon as possible.

The doctors are exposed to flu-infected patients; Derek prepares to give a speech; a new doctor gives Alex a glimpse into an alternative medical practice.

Cristina won't allow herself to get excited when she is nominated for a Harper Avery award, and Alex thinks about making a change. Callie and Derek work with a machine that recognises emotions.

Maggie tries to make a good impression but finds herself in unfortunate situations. Meanwhile, Richard keeps hiding his secret.

Jackson must deliver bad news to the doctors; Derek's sister visits; Richard surprises Catherine in Boston; Bailey makes a risky decision about her research.