Where's an enchanted rabbit's foot when you need one? Sam (Jared Padalecki) and Dean Winchester (Jensen Ackles) are having a seriously long streak of bad luck ... we'd estimate about six and a half seasons' worth.

If this exclusive sneak peek at the promo for this week's 'Supernatural' is any indication, things are going to get way worse before they get better.

In 'Slash Fiction' (Friday, 9PM ET on The CW), our heroes find themselves on the run and forced off the grid after two Leviathans clone them and embark on a 'Pulp Fiction'-esque killing spree using their very attractive faces. Ordinarily, we'd be on board with twice the Winchester goodness, but in this case, we like our men a little less homicidal.

Hit the jump for our sneak peek at this week's extended promo clip, then check out our interview with executive producer Sera Gamble for a look at what else is coming up this season.

Here's the description of this week's double-Winchester installment:

Sam and Dean are once again on the FBI's "Most Wanted" list when two Leviathans clone the brothers and go on a killing spree. The subject of a nationwide manhunt, Sam and Dean need to drop off the grid, so Bobby (Jim Beaver) sends them to Frank Deveraux (guest star Kevin R. McNally), a quirky surveillance expert, for help. Meanwhile, Bobby continues to search for a way to kill the Leviathans, or at least slow them down, so the real Winchesters can stop their evil doppelgangers. 'Slash Fiction' was written by Robbie Thompson and directed by John Showalter.

'Supernatural' airs Fridays at 9PM ET on The CW.

Are you looking forward to seeing a darker side of "Sam and Dean?" Share your reactions and predictions below!

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