Supernatural (TV series)/Recap/S06/E18 Frontierland

Season 6, Episode 18:

Frontierland
Castiel sends Sam and Dean back in time so that they can retrieve the ashes of a phoenix -- the only thing Eve is vulnerable to.

Tropes
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 * Badass Longcoat
 * Retired Gunslinger -- Samuel Colt
 * Right on the Tick: Shows up in "Frontierland," the western-inspired episode in season six. Naturally, there's a showdown at high noon.
 * Time Travel
 * The Wild West: Thanks to Time Travel.
 * Write Back to the Future
 * Wrong Genre Savvy