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After arriving home from a party, Janet Dutton starts brushing her teeth, only to have them start falling out.

'Witches? I'm guessing?' John questioned. Dean nodded.

'Witches are gross.' Dean commented as he shuddered.

Soon after, her husband Paul finds her dead on the bathroom floor. Posing as investigators from the Centers for Disease Control (CDC), Sam and Dean interview Paul and search the house.

'There is definitely something weird going on there.' Cas said, looking confused.

'Obviously.' Dean said, sarcastically.

Dean suspects Paul is lying about something, and Sam finds a hex bag hidden in the bathroom, indicating a witch was involved. Dean complains that he hates witches because they are always spewing their bodily fluids.

'They're always killing poor little innocent creatures as well.' Dean comments.

That night a woman, Amanda, casts a spell and Paul nearly dies while eating a burger that becomes infested with maggots.

'That is so gross.' Jo commented.

'Totally.' Dean replied, shuddering.

He is saved when Sam and Dean arrive and burn a hex bag they find in his car.

'I guess that's the one good thing about witches. If you can find the hex bag you can stop the spell.' Jo commented.

When the spell unexpectedly ends, Amanda panics before being attacked by a mysterious force that slashes her wrists, causing her to bleed to death.

'Why would someone kill her? Was there more than one witch?' Jo asked.

'There was a coven.' Dean replied.

'Nice. I never got to hunt a full coven of witches before.' Jo replied, wistfully.

Paul admits he had an affair with Amanda, which he had ended the previous week against her wishes.

'So that's what he was lying about.' Jo commented, looking disgusted.

When Sam and Dean arrive at her home they find her dead, surrounded by the paraphernalia of witchcraft. Dean almost runs into a dead rabbit and he wonders why rabbits always get screwed in the deal.

'I swear that so many spells need rabbits. What did they do to deserve it?' Dean commented, sadly.

Elsewhere in the town three of Amanda's neighbors, Tammi, Elizabeth, and Renee, meet under the guise of a book club. It soon becomes apparent that they are actually practicing witchcraft.

'That's a pretty good cover. Most covens aren't that careful.' John commented.

The next day Sam and Dean interview the women and while they don't learn much, their research shows that a couple of them have lately had a run of successes and windfalls.

'So they weren't just using it to kill people. Why did they randomly decide to start?' Cas questioned.

'You'll find out.' Sam replied.

Sam suggests that they should kill the women as they are using dark magic and have murdered people.

'Really? But they're human?' Jo commented, looking at Sam with a frown.

'They still killed people and it's not like we can put them in jail but mabye I was a bit harsh.' Sam replied.

In the Impala, Sam argues that they should kill the witches and Dean reminds him that they are humans and Sam replies that they are murderers. Eventually Dean agrees.

'I'm sure glad you two developed a conscience.' Jo commented, sarcastically.

'Yeah. We weren't in the best headspace.' Sam commented.

As they head back to their motel, the Impala is stopped when Ruby appears on the road.

'Why does she keep turning pestering you? You have no reason to trust her.' Mary wonders. Dean stifles a laugh and Sam glares at him.

'Please tell me you didn't trust her and then regret it.' Mary questioned, sighing.

'Not exactly.' Dean replied, smirking.

'Shut up.' Sam replied, hitting Dean on the arm.

She tells them that a demon is in town, controlling the witches, and that the demon will come after Sam. She advises him to leave immediately. Dean argues that they shouldn't listen to her and draws the Colt, but Sam stops Dean just as he tries to shoot Ruby, who vanishes.

'What! You'll kill witches but not some demon?' Jo asked.

'I thought she would be useful.' Sam mumbled.

At the motel, Dean questions Sam as to why he is no longer concerned over taking human life and they argue about what to do about Ruby. Sam reminds Dean about Cammi and how he didn't want her dead.

'You did kinda like her.' Sam said, with a smile.

'Oh don't you start...' Dean started and Sam sighed and decided to be quiet.

Sam admits he is trying to be more like Dean, to prepare himself for dealing with the demon war after Dean is dead. Suddenly Dean feels intense pain, and starts vomiting blood. They suspect it is a spell caused by the coven. Unable to find a hex bag, Sam grabs the Colt and takes off to confront the women.

'You just left him? There's no way you managed to get the witch to stop in time.' John commented.

'Ruby helped.' Sam muttered.

At the house, they deny all knowledge of what is happening to Dean, until Tammi reveals herself to be a demon, killing Renee. Back at the motel, Ruby arrives and doses Dean with a potion that saves him and she tells him not to call her bitch.

'I just don't get why she is helping you.' Jo commented.

'It's complicated.' Sam replied.

'Yeah. Very complicated.' Dean replied, with a smirk. Sam sighed.

Sam tries to shoot Tammi with the Colt but she stops the bullet in mid-air and then uses her power to pin Sam to the wall. She tells him that a new leader has arisen to lead the demons and that she wants Sam eliminated.

'Why does she want you?' Mary asked, looking concerned.

'I'm sure it will explain later.' Sam replied, sounding annoyed.

Dean arrives, but is also attacked by Tammi. When Ruby appears, she pretends she has led the Winchesters to Tammi in order to gain her favour, but then tries to kill Tammi with her knife. Tammi overpowers Ruby and reveals that Ruby was once a witch who sold her soul to a demon – Tammi.

'So she was lying to you. I can't believe you guys trusted her.' Mary commented.

Just as Tammi is about to kill Ruby, Elizabeth starts a spell. Although Tammi kills her, she is distracted long enough for Dean to grab Ruby's knife and kill her. Later that night, Ruby visits Dean and admits that she can't save him from Hell.

'And you trusted her? She's clearly playing you.' Mary commented again, surprised that her sons were so easily persuaded. Sam sighed again.

She tells him that all demons were human once, but that Hell strips away their identity. She also tells Dean that the same will happen to him and that there is no way to stop him from going to Hell.

Mary looked at Dean, worriedly. She could not work out how he would be able to get out of his deal.

'Obviously she didn't know how to get him out of the deal.' John said, with a sigh.

She says she wants him to help prepare Sam to fight the demons after Dean is gone. Ruby retains a memory of what it was to be human and wants to fight on the side of humanity.

'Sure she does.' Sam replied, bitterly.