|Actor|| Nicki Aycox (Season 1)|
Jared Padalecki (2.14)
Rachel Miner (Seasons 5-8)
|Dates||???? - 2013 (killed by Crowley)|
|Episode(s)|| 1.11 Scarecrow|
1.22 Devil's Trap
2.14 Born Under a Bad Sign
5.01 Sympathy for the Devil
5.10 Abandon All Hope...
6.10 Caged Heat
7.17 The Born-Again Identity
7.21 Reading Is Fundamental
7.23 Survival of the Fittest
8.17 Goodbye Stranger
Well, I've lied... a lot. I've stolen. I've lusted. And the other day I met this man - a nice guy, you know? And we had a really good chat... sort of like this. Then I slit his throat and ripped his heart out through his chest. Does that make me a bad person?
– Meg, 1.21 Salvation
Look, I'm simpler than you think. I've figured one thing out about this world – just one, pretty much. You find a cause, and you serve it. Give yourself over, and it orders your life. Lucifer and Yellow Eyes – their mission was it for me.
– Meg, 7.21 Reading Is Fundamental
Meg is a black-eyed demon who trained as a torturer in Hell under Alastair. She initially worked for Azazel, and later for Lucifer. She acts as Azazel's agent and kept tabs on Sam after he left Stanford to hunt with Dean. 
The demon has black eyes and other characteristics similar to those of the common demon, although over time she has become more powerful. When she first appears she works for Azazel, who she calls "father." He later refers to her as his daughter.
The demon is referred to as Meg after the name of the host in which she first appears, Meg Masters.
Following the death of her host body, Meg Masters, and her exorcism, the demon returns to Hell but later escapes and possesses Sam. She plans to use Sam to kill as many hunters as she can and to torture and eventually kill Dean as her revenge on them. She is stopped and eventually exorcised again, but is not sent back to Hell.
Meg returns after the Apocalypse has begun, possessing the body of a young girl from Cheboygan, MI who moved to Los Angeles to be an actress. She shows herself to be loyal to Lucifer and has a demon possess Bobby to find out about the "Michael Sword." By turning Ruby's knife on himself, Bobby kills the demon but also paralyzes himself.
Meg is with Lucifer in Carthage, Missouri when the Winchesters, Castiel, Ellen, and Jo arrive to attempt to kill Lucifer with the Colt. She sends hellhounds to attack them, which ultimately results in Ellen and Jo's deaths. Lucifer sends her to guard Castiel, who is trapped in a ring of burning holy oil, but he manages to break free by making her fall into the flames and using her meatsuit as a bridge.
Following Lucifer's imprisonment, Crowley takes power in Hell and aims to kill those loyal to Lucifer. Sam deduces that she is on the run, and he and Dean agree to help her find Crowley as part of their quest to restore Sam's soul. After they learn that Crowley cannot retrieve Sam's soul, Castiel "kills" Crowley, and Meg escapes.
Meg later reappears when Dean has located Castiel/Emmanuel and is trying to get to Sam to heal him. They form an alliance to protect Castiel as she doesn't want Crowley getting him. She later takes up a job as a nurse to protect him and saves him from Hester. Meg helps in the assault on SucroCorp, but is captured by demons working for Crowley afterwards. She is held captive for the next year by Crowley.
When Crowley learns of the existence of the angel tablet and that it may be stored in one of Lucifer's Crypts, Crowley tortures Meg for information. She is eventually rescued by Castiel and she leads him Sam and Dean to the crypt where the angel tablet is. Meg ultimately sacrifices herself to allow Sam, Dean and Castiel to escape, despite knowing their plans to seal the Gates of Hell.
- She first possessed Meg Masters around October 2005, and possessed her for a year before she was exorcised around November 2006.
- Around March 2007 (see season two timeline), she possesses Sam (aka Evil!Sam). Her powers seem stronger and she says she no longer gives a "rat's ass" for Azazel's plans. Eventually flees Sam.
- Sometime in 2009, Meg reappears in a new meatsuit and is working with Lucifer.
- Several months after Dean returns to hunting, Meg approaches the Winchesters. Their partnership results in the apparent death of Crowley, but not a lasting alliance.
- Several months after the leviathans rise, Meg forms another alliance with Sam and Dean to protect Castiel from Crowley. She is instrumental in the assault on SucroCorp, but is captured by demons afterwards.
- Over a year later, Meg is tortured by Crowley for the location of Lucifer's Crypts before being rescued by Castiel. She ultimately sacrifices herself to buy Sam, Dean and Castiel time to escape with the angel tablet.
Meg has black eyes (irises and sclerae). Her true face is not shown, but an insane Castiel describes her as being "so beautiful"; if not a product of his skewed view of the world at the time or a line of poetry, which Meg hates, then this is highly unusual, as the true forms of demons are usually described in horrific terms. Meg has a preference for possessing beautiful women. She has shown knowledge of spells that even most other demons haven't, and as a pupil of Alastair, she is skilled at both enduring and inflicting torture. Her presence causes sudden gusts of air.
Powers and abilities
- Has superhuman strength and durability.
- Can possess humans. However, she can't possess people warded against demonic possession with a particular symbol.
- Unlike lesser demons, she can set foot upon hallowed ground. 
- Is telekinetic.
- Has the power to psychically inflict internal injuries severe enough to make even a demon as powerful as Crowley fall to his knees in pain.
- Can teleport.
- Is telepathic, learning all the thoughts and emotions of her meatsuits when she possesses them.
- Is burned by any form of contact with holy water.
- Is naturally vulnerable to devil's traps. However, she learns of a spell which allows her to break a devil's trap from within once she enters one, effectively rendering them a mere hindrance to her.
- Vulnerable against holy fire. 
- Can be killed with Ruby's knife, the Colt, or an angel blade.
Sam has left Dean and is traveling to find his father in California when he encounters Meg Masters, who is also hitch-hiking. Their first encounter is brief, as she soon gets a lift with "sleazy van guy." She later turns up at the bus station and she and Sam bond over feeling trapped by their families' expectations. Meg tries to dissuade Sam from going back to his brother when he becomes concerned that Dean is in trouble. At the end of the episode, Meg has found another ride. She gets the driver to pull over and then cuts his throat with a dagger, collecting his blood in a goblet. She swirls the blood with her finger, and after a Latin incantation, communicates with someone she calls "father." She reveals that she knows the true identity of Sam and Dean and wanted to kill them, but has apparently been instructed not to do so.
The boys run into Meg in a bar in Chicago. Sam is immediately suspicious of this coincidence and follows her, eventually discovering that she has a black altar set up in an abandoned warehouse, and is controlling the daevas. She again uses the goblet of blood to communicate with someone to whom she reports. It is later shown that the whole set-up is a ploy to lure John Winchester and the boys to Chicago. Meg fails in her plan to destroy the family despite capturing Sam and Dean because when her altar is destroyed, the daevas turn on her. She plummets from one of the warehouse's upper stories down to the sidewalk. However, she survives and uses a necklace to regain control of the daevas and use them to try to kill the Winchesters. Sam manages to drive them off with a flare and Meg watches, unhappy, from nearby as Sam, Dean and John go their separate ways.
Meg murders John Winchester's friends Pastor Jim and Caleb in order to force him to hand over the Colt. She gets John to come to a warehouse in Lincoln, Nebraska on the corner of Wabash and Lake. He hands over a fake Colt, which is identified as such when Meg's "brother" Tom shoots her with it and she doesn't die. She and Tom then capture John Winchester.
Meg calls Dean to reveal that she is holding their father. Later she tracks the brothers down at Bobby Singer's place, but is captured under the devil's trap on Bobby's ceiling. Sam starts to exorcise her, while Dean interrogates her as to their dad's whereabouts She eventually gives it up, but when Dean wants to continue the exorcism, Bobby points out that she is actually a woman possessed by a demon, and that because of the injuries she sustained in Chicago, will die when the demon leaves her. The demon is banished, and the human Meg tells Sam and Dean more about where John is being held before she dies and that the demon had wanted them to know as it is a trap. Later, when Azazel reveals himself to Sam and Dean, he reveals that he knows that they exorcised his "daughter" and holds a grudge against Dean for it, saying that Dean "destroyed" her. When Dean taunts him about it, Azazel telekinetically slashes his abdomen open in revenge, nearly killing Dean.
Along with Tom, Meg is referred to by Azazel as somebody very special to him whom he has lost because of Dean, for which Azazel wants Dean dead almost as badly as he wants to get the Colt. In saying so, he again refers to Dean as having "killed" Meg and Tom; however, 2.14 Born Under a Bad Sign reveals that Meg is still alive but trapped in Hell, something Azazel would presumably be aware of (if he knew the effects of an exorcism).
Meg has been in Hell - which she describes as "a prison, made of bone and flesh and blood and fear." She has escaped to possess Sam, planning to kill hunters and provoke Dean into killing Sam. While possessing Sam, Meg smokes menthol cigarettes and drinks hard liquor. She kills a hunter, Steve Wandell, and using Jo for bait, nearly kills Dean. She then goes after Bobby, but her possession of Sam is revealed when Bobby gives her beer laced with holy water.
Bobby and Dean trap her beneath a devil's trap, and she reveals that she no longer gives a "rat's ass" for the plans of the Yellow-Eyed Demon. Bobby and Dean find it difficult to exorcise because it has used a binding link to bind herself to Sam's body. Bobby finally burns the link with a fire iron, and the demon flees, but does not go to Hell.
Lilith casts a spell that breaks one of the 66 Seals that hold Lucifer captive and causing the Rise of the Witnesses - ghosts of people killed in supernatural situations. They return as vengeful spirits and kill those who "let" them die: hunters. Meg Masters returns and confronts Dean. She tells him how she was a college student when she was possessed, that she was awake during her possession, and witnessed much horror. She also tells him how her disappearance had a terrible effect on her younger sister, who killed herself after Meg was found dead. The spirit of Meg Masters is put to rest when Bobby completes his spell.
When Dean works out the meaning of Chuck's message about the location of the Michael Sword, Bobby attacks him, revealing that he is possessed by a demon. At that point Meg arrives - Dean initially assuming that she is Ruby before Meg encourages him to think back further, informing Dean that the demons want him dead so he can't stop Lucifer. She orders the possessed Bobby to kill Dean with Ruby's knife, but just as he is about to strike, Bobby manages to battle the demon and stab himself instead. Sam returns and helps dispatch the other two demons, but Meg escapes by leaving her vessel before Dean can kill her.
Meg apparently recovered her vessel and joined Lucifer after her encounter with the Winchesters. She is present with Lucifer in the city of Carthage, Missouri when Lucifer performs the ritual to release Death. Meg confronts Sam, Dean, Ellen, and Jo in the streets of Carthage, setting a pack of hellhounds on the group. Jo is grievously wounded and they retreat to a hardware store to regroup.
Meg returns to Lucifer's side to ask for further instructions. He tells her to leave the brothers be, and leaves her to watch over Castiel, whom Lucifer has trapped within a ring of burning holy oil. Meg gleefully revels in the fact she and her kind are "winning" and taunts the angel about it. Castiel counters with what the demon Crowley's told the Winchesters: that Lucifer cares little for demons and sees them as a means to an end that will be destroyed as soon as humans are eradicated.
Meg does not believe him and comes forward to argue. Castiel telekinetically releases a large pipe from the ceiling above her and it swings forward, knocking Meg through the fire and into his arms. Castiel immediately tries to exorcise her with his touch, but his power fails him now that he is cut off from Heaven. Meg mocks Castiel, asking what he plans to do now that he is powerless. Castiel replies by throwing her onto the fire, and as she screams in agony walks over her body to escape from captivity.
Meg returns in her previous host, despite the fact that it has been thrown into holy fire by Castiel. She and other Lucifer loyalists are being hunted by Crowley so she kidnaps Sam and Dean in order to force them to reveal Crowley's location. As Sam states, it was either "him or her."
Sam strikes a deal with her: she can torture and kill Crowley if Sam gets his soul back. Meg, the Winchesters and Castiel act on a tip from Samuel Campbell and locate Crowley's prison and infiltrate it, but are soon discovered by hellhounds. Meg offers to hold them off and kisses Castiel, and gets an even more passionate kiss in return. When they separate, Meg is holding his angel blade.
She kills the hellhounds with the weapon, but is then captured by a possessed Christian Campbell, who begins to torture her. Meg laughs at the pain, saying her host is a girl who moved to LA wanting to be an actress, and this probably wasn't even the worst thing to happen to her. While she is speaking, Dean kills Christian with Ruby's knife. After trapping Crowley under a devil's trap, Meg tortures him to find out if he can restore Sam's soul. When he insists that he cannot, Dean hands the Ruby's knife to her so she can kill Crowley, but he overpowers her and uses the knife to break the devil's trap. Castiel then appears with Crowley's bones, which he burns, killing Crowley. In the moment, Meg escapes before Dean can kill her.
As Dean takes Emmanuel Allen (the amnesiac Castiel) back to Northern Indiana State Hospital in the hope to cure Sam, who is being held there. Stopping to buy food, Dean is attacked by demons, but Meg shows up and kills one demon while the other flees. Dean is surprised to see her, and she tells him that she's there because of rumors about a wandering healer, who she's shocked to learn is "poor dead Castiel." She has an ongoing feud with Crowley and, like Dean, doesn't want him to know about Cas. Although they don't trust each other, Dean agrees to let her come with them to Indiana as long as she doesn't remind Castiel of his true identity yet. The three of them leave together.
At the hospital, Meg tells Castiel he's an angel and that he and Dean were best friends who used to fight together. Emmanuel realizes that he must be the "Cas" that Dean told him about, and he apologizes. After fighting the demons they find around the hospital, and his memories come back to him, assaulting him with images of his partnership with Crowley and his betrayal of Dean. Once the demons are taken care of, Meg and Dean approach him. He tells them that he remembers them—he remembers everything.
Unable to heal Sam, Castiel takes on his psychic damage himself. Meg gets a job at the hospital as a nurse so she can watch over him.
Meg rings the boys to let them know that Castiel has woken from his coma. When they arrive, Castiel is obviously not completely sane. He also seems to have become rather attached to Meg.
After the prophet Kevin Tran arrives to steal the Word of God, two angels arrive named Hester and Inias who try to kill Meg. Meg holds off Inias with an angel blade that she says she got as "a lot of angels died this year," but before the situation can degenerate, Dean banishes the two and Castiel with an angel banishing sigil. Meg then travels with the boys, Kevin and Castiel to Rufus's cabin. At a gas stop on the way, Meg sees that a couple of demons are following them.
Later she meets up with the demons, under the pretense of making a deal, but instead kills them with Ruby's knife. When she returns to the cabin, the boys catch her in a devil's trap, but she convinces them that her method of surviving is to find a cause - Lucifer, Azazel and follow it. Currently all she cares about is destroying Crowley. Sam and Dean believe her and set her free. Just then the angels arrive, having learned where they were because of her exposing herself. When Hester tries to kill Castiel, Meg kills the angel with her angel blade and then disappears into hiding again.
After learning that all the angels of his garrison have been killed, Castiel fetches Meg and has her take him to the Winchesters. There Meg is worried when she learns that they summoned Crowley who appears before she can flee and threatens her with painful torture. However, as the Winchesters need Castiel and he is fond of Meg, Crowley leaves her in Castiel's custody though he promises to get her later. When Castiel disappears after Sam and Dean demand to know what Crowley meant about him being able to help them kill Dick Roman, Meg explains that as the former vessel to all the Leviathans, Castiel can tell them apart and thus pick out the real Dick.
When the group assaults SucroCorp, Meg helps by creating a distraction: she drives the Impala through SucroCorp's main gate and giant glass sign, drawing out the Leviathan guards and allowing Sam, Dean and Castiel to sneak in. Meg, armed with a machete and Power Clean and immune to the guards bullets as a demon, dispatches the leviathan guards but before she can leave, she is attacked by two demons working for Crowley. They inform her that "the King of Hell will see you now."
Having figured out that the angel tablet is in one of Lucifer's Crypts, Crowley tortures Meg for their locations as she knows where they are from her time with Azazel. Meg gives general locations, lying that she doesn't know exactly where they are to buy herself time to figure out a way to escape. During this time, Crowley also has her hair dyed blonde, something she hates. Eventually Castiel, who is searching as well, finds out her location from a demon he captured and rescues her. When Sam and Dean find her tied up, she makes a Star Wars joke about the rescue. She is also annoyed that they never searched for her.
After the rescue, Meg explains what Crowley wants and offers to lead them to the correct crypt. The group takes her to the location of the latest person Crowley had a demon possess in his search who has a full-scale model of the town and Meg is able to point out the location to them. While Sam and Dean try to figure out what is now there, Castiel bandages Meg's wounds which have started to fester. Meg flirts with him about the time he kissed her (The Pizza Man) and indicates that she has feelings for him, telling him subtly that she wants to have sex with him if they survive retrieving the Angel Tablet, which he initially doesn't get, but accepts as he begins to understand.
After finding out that the crypt is located beneath a warehouse, the group travels there and Dean leaves Meg and Sam outside to guard the building while he and Castiel search. Meg and Sam demon-proof the building and Meg questions him about what he did for the year, telling him that from the time she possessed him she understands that he really wants a normal life. When Sam explains what happened, Meg initially makes fun of him for stopping when he hit a dog, but shows understanding about how falling for someone can change your life and refers to Amelia as a unicorn. Two demons show up and attack and in the fight that follows, Meg kills one with her angel blade, but Crowley himself shows up. Meg tells Sam to find Dean while she holds Crowley off. Crowley tries to convince Meg to turn on the Winchesters, telling her about their plan to kill him and seal the Gates of Hell and trap all demons, but Meg tells him the idea that he will be killed alone has convinced her of their plan and tries to fight him. Meg proves no match for Crowley and taunts him when she sees Sam and Dean starting to drive away without Castiel who she figures has the tablet. Meg stabs Crowley in the shoulder with her blade, injuring him slightly. In retaliation, Crowley stabs Meg with a sword of his own, killing her while Sam and Dean watch, horrified, as they drive away.