Alan tries to avoid bringing his sexy 22-year-old girlfriend to Jake's birthday party.
Meredith feels left out when Derek breaks ground on his clinical trial; Bailey's new idea does not go over well with the Chief; Callie irritates her new obstetrician (Rachael Taylor).
The team must stop a gang of suspected murderers that is targeting a new victim nightly.
Big Brother Doug (Kevin James) tries anything to impress his new protege, including entering a 10K run. With Leah Remini and Patton Oswalt.
When the team discovers an illegal weapons dealer has sold stock to someone targeting a high-level politician, they rush to stop a deadly ambush.
