Maria Elena Maglaris

The interns deal with a family involved in a car accident, Derek lets his emotions get the best of him, and Burke and Izzie make a new suggestion to Denny.

Seattle Grace institutes a "date-and-tell" policy after the nurses complain of Mark's trysts; Cristina is forced to confront her feelings about Preston.

As Callie is faced with a malpractice suit, her supportive father (Hector Elizondo) visits and shares a secret; past details about Callie and Arizona's marriage are revealed.

Cristina looks to Meredith for advice as she assesses her future at the hospital. Derek and Amelia work together on a difficult surgery involving conjoined twins. Meanwhile, Jo is spread too thin when she tries to work on several cases at once and Stephanie realizes the truth about Bailey's bubble boy case.