Brave New World
| Episode Number | 4 |
|---|---|
| Season | 5 |
| Aired | 2008-10-16 |
| Overview | Meredith is sent into a state of panic when Derek finds her mother's diary in the house. Meanwhile, Callie stresses while preparing for her first date with Erica. Later, Cristina stumbles across a part of the hospital no one has ever seen before. |
| Runtime | 43 minutes |
| Absolute Number | 82 |
| Finale Type |