5x13 The Song Remains the Same
First Aired: Feb. 04, 2010 on The CW
Summary: Anna travels back in time to kill Mary and John Winchester before they can conceive Sam and Dean, thus preventing the apocalypse. Castiel transports the brothers back to save their own parents, but they must answer awkward questions when their parents begin to wonder what's going on.
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Guest Stars[no credits found]