A band of angels are being picked off one by one. Ishim leads these Angels that are being killed, they once came to earth 100 years ago to kill a Nephilim, a human birthed by an angel and human. Castiel is also part of this group. So Sam and Dean go with Castiel to find out why and to see if they can help. Ishim doesn't like humans, especially the Winchesters, but something is not right as Lily Sunder is the one taking the angels out. More secrets are revealed that are not quite what they seem to be now.
—stephen scialli