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Rowena is an extremely powerful natural-born [[witch]], originally from Scotland in the 17th century (or possibly earlier). Before Rowena became a witch she was a peasant and the daughter of a tanner, who had an affair with a man above her social class. Once her son Fergus was born the man abandoned the two and went back to his rich wife and her grand house. Her son Fergus Roderick MacLeod, would father [[Gavin MacLeod]] and go onto on to become known as the demon [[Crowley]].

Rowena was initially antagonistic towards the Winchesters as she saw Crowley's relationship with them as diminishing his power. The Winchesters often called on her help with magic, which and Rowena assisted when she saw a benefit for herself. Over time, she became an ally in their battles, albeit motivated by the benefit she saw for herself in helping them. Rowena had a particular bond with Sam -- they were both tortured by [[Lucifer]] and saw his true face, and share the struggle of living with that experience.

With the device constructed, Rowena enters the neighborhood to meet with Sam and Dean. She encounters the ghost of [[Francis Tumblety]] , with whom she had a brief liaison centuries ago in England. He wants her to deliver a message to the Winchesters -- the ghosts have Kevin and want to talk to them. Ketch appears and shots him with his gun. Rowena runs away but Ketch is knocked out by Tumblety from behind. When Rowena arrives, she tells them about Ketch and that she's not sure if her crystal works.

Outside of the warding and at its weakest spot, Sam, Dean, Belphegor, Castiel, Rowena, and Kevin watch the ghosts attempting to escape. The demon says that there are about a hundred spirits already and that more are coming as Ketch joins them. Rowena proceeds with her crystal, catching a large number of souls, but she gets knocked out by Ketch, who is possessed by Tumblety. He wants to use the crystal with all the souls to destroy the warding, but is shot by Dean. Rowena takes the crystal again and catches the remaining ghosts, including Tumblety. However , more souls are escaping from Hell, and the containment spell won't hold for much longer.

Rowena has the Winchesters, Castiel , and Belphegor take her back to the crypt so she can cast the ''Rafforza l'incantesimo '' spell from the Book of the Damned to strengthen the barrier. Though Rowena expresses confidence that the spell will work, it fails and she becomes convinced that they are all going to die, explaining that the barrier is now too weak and the ghosts too strong for it to work. Rowena warns that together the ghosts are too strong and the barrier will fall and there's no magic on Earth that can stop it. If they are lucky, they have only hours. Dean asks Rowena to create some more Soul Catchers, but she informs him that it wouldn't matter and insists that its it's over. Rowena suggests that if she had gotten there sooner, she could've tried any number of spells to close the rupture before it got to this point, but it is now too late. As Dean prepares to fight to the end against the ghosts, Rowena looks through the Book of the Damned and Sam questions if there is anything useful in it, but she tells him there's "not a thing."

When Belphegor suggests a plan to call all of Hell's souls back with Lilith's Crook, Rowena states that she can close the rupture using the ''Sanetur Acre Vulnus'', a healing spell of her own creation. As the rupture is a wound rather than a gateway, she can use the spell to heal the wound, causing the hole to close itself up. Rowena warns that they must time it perfectly and wonders how they will know when to start if Belphegor is in Hell when everything goes down. Belphegor assures Rowena that she will know when the time comes and Rowena states that they will need a few ingredients, nothing too exotic: lavender, myrrh, the skull of an owl, quiet to perform the spell , and an assistant. Rowena She requests Sam's help, stating that he is the closest thing they have to a seasoned witch amongst the group , aside from herself. However, they also need someone close to the edge to serve as a carrier for the spell, someone who will carry it and toss it into the rupture when the time is right. However, whoever performs this duty will be unprotected from the ghosts and can't use salt circles. Dean volunteers for that job, but . Belphegor states that he needs protection for his trip to Hell and Dean volunteers Castiel for help.

Shortly afterwards, Stevie brings Rowena the ingredients for the spell and is annoyed by the witch's lack of a thank you. Stevie warns that most of the ghosts are at the edge of town trying to break down the barrier and asks if they are planning "another magical long shot Hail Mary" which Dean confirms, stating that it hopefully works this time with a pointed look at Rowena. As Sam is distracted wanting to help Dean, Rowena reminds him to keep focused on his role in the plan. After hearing the blowing of the horn and the shaking of the ground caused by the souls returning to Hell, Rowena and Sam perform the spell together. Though the rupture begins to close, Castiel is forced to kill Belphegor before all of the souls are sucked back into Hell , which Rowena immediately senses.

As Sam and Dean try to figure out what happened, Rowena grabs a knife and cuts her last Resurrection Seal resurrection sachet out of her left shoulder , to Sam's shock. Rowena explains that Lilith's Crook and Belphegor sucking the souls into Hell was the Winchesters' only shot, but it wasn't Rowena's only shot: magic can do anything and contain anything, including the vast multitudes of Hell. Rowena can soak the souls up for a time if she pays the price: a spell so simple that it draws its power from its caster and only requires two ingredients. Sam questions why she didn't tell them before and Rowena explains that the ingredients are her own still-coursing blood and her final breath. Rowena can absorb the ghosts and demons and return them to Hell , where her body will break down in over time and release them back where they belong. Sam realizes that Rowena means she will have to sacrifice herself , which she confirms , along with the fact that Sam must be the one to kill her. Rowena reminds Sam that her real permanent demise is at his hands according to Death's books, but Sam continues to refuse. Rowena tells Sam that she can't do it herself and it has to be him. Though She says she wishes there was another way, that she doesn't care about anything enough to take her own life, not Sam, not Dean and not even the world. However, Rowena believes in prophecy and magic and they are both there with everything they need to end this. Rowena insists that she knows it in her bones that it has to be this way and demands that Sam kill her.

Tearfully smiling at Sam, Rowena acknowledges that they have grown quite fond of each other and asks if Sam is willing to let his brother and the world die to save her. Crying, Sam pulls Rowena into a hug while stabbing her in the abdomen with the knife. Rowena tells Sam "that's my boy," before pulling out the knife and casting the spell. Walking towards the rupture, the mortally wounded Rowena draws all the souls and demons that escaped from Hell into herself until she has them all. Stopping at the edge, Rowena looks back at Sam, Dean , and Castiel one last time and tells them "goodbye, boys" before throwing herself into the rupture. Rowena's devastated friends watch as she falls into Hell, the rupture sealing itself behind her.