Grey's Anatomy is known for its tantalizing, song-based titles, and the newly revealed name of Season 9, Episode 13 is especially intriguing.

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According to Zap2it, Episode 13 is titled "Bad Blood."

What could that mean? A number of options come to mind. It could be a reference to metaphorical bad blood between two characters. Maybe an unwanted visitor from the past shows up to haunt one of the docs? Maybe there's a fight?

Of course, this being a hospital show, the title could be a bit more literal. Perhaps one of the patients (or Shonda forbid, one of the docs) suffers from some sort of blood disease?

Share your theories in the comments below!

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Source: Zap2it

Catch the next new episode of Grey’s Anatomy on Thursday, January 17, 2013, at 9 p.m. ET/PT on ABC.