More Things in Heaven and Earth, Horatio (Supernatural/Doctor Who, PG)

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Title: More Things in Heaven and Earth, Horatio
Rating: PG
Fandoms: Supernatural/Doctor Who
Characters: Dean Winchester, Sam Winchester, Castiel, the Ninth Doctor
Summary:  The Winchesters and Castiel find a big blue box sitting on top of the Impala.  Dean is not amused.
Spoilers: Generally for Supernatural Season 5.
A/N:  This takes place after "Abandon All Hope" for Supernatural and pre-"Rose" for Doctor Who.

Two hunters and an angel walk into a TARDIS...