Supernatural
When they were boys, Sam and Dean Winchester lost their mother to a mysterious and demonic supernatural force. Subsequently, their father raised them to be soldiers. He taught them about the paranormal evil that lives in the dark corners and on the back roads of America ... and he taught them how to kill it. Now, the Winchester brothers crisscross the country in their '67 Chevy Impala, battling every kind of supernatural threat they encounter along the way.

Season 4 · Episode 16 ·
On the Head of a Pin
Can torture be God's work? After seven angels are mysteriously murdered, Castiel and Uriel demand that Dean use the agony-inducing skills he learned in Hell to extract information from Alastair.
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Episode 16 of season 4 of Supernatural: “On the Head of a Pin”. Aired 2009-03-19. Watch it online free on ZapFlix.