Meredith and Lexie's father returns to Seattle Grace with stomach pains and a new girlfriend; Alex butts heads with the new OB; Mark bribes Jackson for information on Lexie.
When a crisis at LAX leaves dozens of airplanes unable to land, the government enlists a team of misfit geniuses to save the day.
Rookie cop Ben Sherman wonders if he is cut out for the job; a girl is kidnapped.
The team heads outside the hospital to help provide medical attention at the scene of an emergency.
An unidentified woman is found dead in an alley; Nate's little sister goes missing and secrets from his past unfurl.