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The CW has released the titles for episode 18 and 19.

Supernatural - Episode 11.18 - Hell's Angel
Supernatural - Episode 11.19 - The Chitters

I'm guessing 18 will be Lucifer/Cas centric. I have no idea what The Chitters will be, a stand alone episode maybe? What do you think? Share your thoughts in the comments or in the discussion threads for episode 18 and episode 19.