Geek Question of the Day: The idea of inserting a themed storyline into an otherwise non-themed story is nothing new, but not all are equal, so tonight's question is; What are your favorite 'themed' episodes/storylines from fiction and what makes them stand out for you? I'm deliberately making this one a bit vague so you can adjust the definition as needed. Any type of fiction, including TV shows, comic books, video games, etc all qualify. It was inspired by comments from George Station last week!
Image source: http://bit.ly/2mz7YV5