10. Goodnight, Nina

(“Chloramphenicol,” season 4, episode 4)

This episode features perhaps the most shocking Americans death of the entire series when Nina is killed in Russia. It isn’t shocking because it happened — frankly, it seemed like Nina was going to be killed two seasons prior, and it always felt like she was living on borrowed time since being sent back to Russia. But Nina was so resourceful in keeping herself alive that what was shocking was the unceremonious way her story came to an end.

Nina’s appeal of the treason charge was denied and she was shot in the head execution-style moments later, her body crumpling onto the dirty floor of a Russian prison. A sad, sudden end to such an interesting character.