Sheriff Mills is back and so are the Winchester brothers' virginities, or so they would like you to think.

An old friend of Bobby Singer's, Mills (Kim Rhodes) is no stranger to the supernatural escapades of the hunters. Before nearly being ganked by Crowley (Mark Sheppard), Mills saw her zombie-esque son kill her husband and had dealings with the leviathans. In "Rock and a Hard Place," Mills seeks out the brothers' help when a string on murders rack her small town.

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Unfortunately for Sam (Jared Padalecki) and Dean (Jensen Ackles), all four of the victims were members of a local church-run chastity group. To investigate the case, the Winchesters will have to pose as something they most defiantly are not.

"The boys become born-again virgins," explained executive producer Jeremy carver, according to E!.

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New promo photos from Spoiler TV reveal that Dean may have a little bit of difficulty with this particular mission. While one still shows him with a stack of chastity themed reading including I Am Pure and The Way To Purity, another image shows him clutching a few of his more preferred DVDs. Although judging on his locale, Dean may have stumbled on someone else's collection.

The episode will feature two new characters. There is Kathy, who runs a church and may hide evil beneath her innocent looks, and a chastity counselor named Suzy, according to Spoiler TV.

Supernatural airs Tuesdays at 9 p.m. on the CW. Click the video below to see a preview for this week's episode, "Bad Boys."