In the Season 2 premiere, In My Time of Dying (2x01), we learn how angry spirits are born. The spirits that Sam and Dean fought in a number of the episodes in Season 1--specifically Pilot (1x01), Dead in the Water (1x03), Bloody Mary (1x05), Hook Man (1x07), Home (1x09), Asylum (1x10), Route 666 (1x13), and Provenance (1x19)--were actually the
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