Supernatural

Season 4 Episode 16

On the Head of a Pin

15
Aired Thursday 8:00 PM Mar 19, 2009 on The CW
AIRED:
9.1
out of 10
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990 votes

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Episode Summary

Someone has killed seven angels, and Castiel and Uriel recruit Dean to interrogate their prisoner, Alastair, to learn who the killer is.

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