Alex treats a patient whose religious beliefs place her life in jeopardy. Meredith wants to know more about Derek, and Izzie ponders contacting her estranged mother.
The wife of a Marine, who specialised in K-9 bomb detection, urges the NCIS team to investigate the recent death of her husband in Afghanistan.
Naomi seeks Fife's help with William's experimental treatment for ALS; Violet and Amelia treat a woman with a brain tumour; Sheldon goes after Charlotte's affections.
Buffy invents an ingenious plan to destroy the First.
Wielding a mystical new weapon, Buffy rejoins the fray on the eve of the final confrontation with Caleb.