Dean & Sam Investigate A Dark Fog on Tonight's 'Supernatural'

Dean (Jensen Ackles) checks on a down officer in this new still from Supernatural.

In “Don’t Call Me Shurley”, Amara (Emily Swallows) unleashes a dark fog on a small town, causing everyone to go mad. When Dean and Sam (Jared Padalecki) realize this is a stronger version of the original black vein virus Amara previously unleashed, they team up with the sheriff to protect the town but their old remedy no longer works.

Meanwhile, Chuck (Rob Benedict) returns with an interesting proposal.

10+ pics inside from Supernatural…