Sarah Hagan

Meredith becomes disenchanted with her ignorance of parts of Derek's life; Alex treats a patient whose religious beliefs jeopardize her chances for recovery; a 40-year-old pregnant woman diagnosed with cancer disagrees with Cristina's advice.

The wife of a Marine who specialized in K-9 bomb detection urges the NCIS team to investigate the recent death of her husband in Afghanistan. Meanwhile, Director Vance asks for the team's assistance as he interviews nannies.

With her parents going out of town, Lindsay attempts to win the freaks' approval by throwing a party - but Sam and his friends are worried when they learn there will be beer at the party.

Halloween night becomes an unexpected turning point for Lindsay and Sam.

Sam is tormented by an older girl at school; Lindsay is surprised when Kim starts being nice to her...but the cause for the sudden change is soon revealed.

Naomi puts Fife in a conflicted position when she begs him to help William's advanced ALS with his still experimental treatment.