AceShowbiz -

Prepare to meet the evil Sam and Dean in the next "Supernatural". Two Leviathans clone the brothers and mercilessly kill people with the disguises, framing the ghost hunter duo for a number of crimes which put them back on the FBI's "Most Wanted" list.

Now that they are subject of a nationwide manhunt, Sam and Dean need to drop off the grid so Bobby sends them to Frank Deveraux, a quirky surveillance expert, for help. Meanwhile, Bobby continues to search for a way to kill the Levianthans, or at least slow them down, so the real Winchesters can stop their evil doppelgangers.

"It's kind of Sam and Dean vs. Sam and Dean, where we have evil Sam and Dean running around - that's pretty great," executive producer Sera Gamble once said about the episode. "Jared (Padalecki) and Jensen (Ackles) clearly had a ton of fun playing the evil sides of themselves. Evil Sam and Dean kind of have a psychological take on why Sam and Dean act the way they do. It's pretty funny."

"They are very smart, they are very adaptable, and basically they find themselves in the land of opportunity," Sera said about the Leviathans. Despite all the bad things they are capable of, Sera insisted the Leviathans are "not violent, angry, slash-and-burn creatures...they're just instinctually corrupt monsters - they're starving and they really like eating people."

Also in "Slash Ficton" which will air Friday, October 28 at 9/8c on The CW, fans will "really dig" the Leviathan boss and will meet him for the first time.