The relationship between the angel Castiel and demon Meg was called Megstiel by Dean Winchester. Since they were polar opposites in their species, they were enemies and sometimes frenemies before eventually becoming allies. Due to the events in Season 7, Castiel began to have a connection with Meg and developed feelings for her.
Due to Castiel being an angel, and Meg a demon, the two are sworn enemies on opposites of the battle for the Apocalypse. Castiel soon betrays heaven to help the Winchesters stop the Apocalypse. Meg is with Lucifer trying to destroy mankind as they know it.
|“|| You seem pleased."|
"We're gonna win. Can you feel it? You cloud-hopping pansies lost the whole damn universe. Lucifer's gonna take over heaven. We're going to heaven, Clarence.
— Castiel and Meg
in Abandon All Hope
|“|| Why are we working with these abominations?"|
"Keep talking dirty. Makes my meatsuit all dewy.
— Castiel and Meg
in Caged Heat
In Caged Heat, Castiel is forced by Sam to work with Meg to take down Crowley. Then again as they gather outside the house, Castiel asks why they are working with demons. They soon storm Crowley's fortress and find themselves hunted by Hellhounds. Meg attempts to escape, but cannot. Castiel tells her that within Crowley's fortress she can't escape due to a spell.
Out of options, Meg decides to stay back to fight in order to give Sam and Dean a shot at killing Crowley. In order to get a weapon, Meg kisses Castiel, taking his sword. As she pulls away, Castiel pushes her against the wall and kisses her again. Meg is stunned and questioned Castiel who says that he learned that from the Pizza Man (a character in a porno movie he had watched earlier in the episode). The rest of the gang leaves and Meg faces off with the Hellhounds.
After the mission is finished, Dean teases Castiel if he wants more time with Meg, but Castiel says no, seemingly unsure of what Dean is implying he might need more time to do, though his body language suggests he may simply have been deflecting Dean's suggestion out of embarrassment.
|“||Will you look at her? My caretaker. All of that thorny pain, so beautiful.||”|
— Castiel about Meg
in Reading Is Fundamental
In The Born-Again Identity, Castiel and Meg meet again but Castiel doesn't remember his past. Meg fully intends to use Castiel as protection against Crowley's demons, but Dean doesn't let her. As they drive back to Sam, Meg attempts to make Castiel remember but Dean shuts her down. When Castiel realizes something is up, Meg blurts out that Castiel is really an angel. Castiel eventually remembers who he is and in order to save Sam, he takes on Sam's memories of Hell. With Castiel in a coma, Meg gets a job at the psych ward and stays behind to watch over him.
In Reading Is Fundamental, Meg is by Castiel's bedside reading a magazine when Castiel awakens. Castiel is different though and begins commenting on how beautiful she is and takes a liking to her. Meg is creeped out by this and calls the Winchesters in. With Castiel's new state of mind, he follows her around and comes to Meg when she calls. When they are escaping from the hospital, Meg calls Castiel and he pops into the car. Meg later kills Hester to protect Castiel, though she claims she did it as something necessary.
In Survival Of The Fittest, Meg is fed up when Castiel forces her to bring him to the Winchesters. When Crowley threatens Meg, Castiel becomes defensive of her, stepping forward and telling Crowley to leave her be, though he has pointedly avoided confrontation of any kind up to this point. Crowley leaves her alone for a while because, as he points out, the Winchesters need Castiel to defeat Dick Roman and it seems Castiel would be angry if she was taken away. Meg seems surprised by this observation. When Dean yells at Castiel, causing him to leave briefly, Meg chides him for his actions and displays knowledge of Castiel's unique ability to tell the Leviathans apart.
|“|| We survive this... I'm gonna order some pizza and we're gonna move some furniture around. You understand?"|
"No, I--I... wait -- actually... Yes, I --
— Castiel and Meg
in Goodbye Stranger
|“||Go. Save your brother. And my Unicorn.||”|
— Meg to Sam
in Goodbye Stranger
Later, while Castiel tends to Meg, the Winchesters discuss the situation, and Dean asks Sam if they can trust "Megstiel" in the other room. Sam replies that they don't have a choice.
Castiel bandages her wounds and she flirts with him, reminding him of the time he kissed her and showing possible feelings for him. Castiel assures her that he is back to being sane and admits that he does remember the kiss and that it is a good memory. Meg tells Castiel that, should they both survive this, they should have sex. Though initially confused by her choice of words, Castiel understands and does not seem opposed. Also, before going inside to obtain the angel tablet, he orders Sam to stay and protect Meg. Later, while discussing with Sam his leaving the life for someone he loves, Meg says she gets why he did it, indicating that she gets it from her possible love for Castiel changing her. Also, Meg describes Amelia as a "unicorn" because she made Sam want to quit the hunting life, but when Crowley appears, she tells Sam to go save his brother and her unicorn, referring to Castiel, confirming her feelings for him.
When Crowley arrives, Meg holds him off to buy the Winchesters and Castiel the time they need. When Castiel doesn't exit with Sam and Dean, she realizes that he has the tablet and as her last act, taunts Crowley about it before stabbing him through the shoulder with an Angel Blade. Enraged at Meg's actions, Crowley kills her with an angel blade of his own and as Castiel does not yet know she is dead, it is unknown what his reaction to this will be. It is also unknown if Castiel had ever been in love with the demon, but it is clear that he felt a very strong connection with her. It can be inferred that had she not died, their relationship would have progressed.
|“|| He's getting cagey - he's using a fake name. Clarence.|
That's what Meg used to call him.
— Sam and Dean about Castiel
in I'm No Angel
In Destiny's Child, though Meg herself doesn't appear, The Shadow takes on her form when it confronts Castiel. Initially believing it to be Meg, Castiel is shown smiling when he greets 'Meg', happy to see her. This shows that he still has fond memories of her, and still cares for her.
Two Sides Of The Same Coin
Though naturally on opposing sides, Castiel and Meg share many similarities.
- Rebelled against their respective sides.
- Both captured and tortured for rebelling.
- Given themselves over to a cause to escape their own doubts and emptiness.
- Have helped the Winchesters on several occasions.
- Have both died for the Winchesters, though in Castiel's case he was resurrected.
They both seem to share an inexplicable attraction to each other. Castiel once described her as a "Thorny Beauty". In Goodbye Stranger, Meg admits that she loves Castiel and was willing to die for him, and does so.
- This is the first romantic relationship between a demon and an angel featured in the series.
- Another known pair is Crowley and Naomi, which was implied in the episode Meg was killed in.
- Prior to meeting Meg, Castiel was shown to be shy around women, and was still a virgin. He seemed to overcome this shyness upon meeting Meg and spending time with her.
- In the Lethe, a Megstiel-centric fanfiction alternative to seasons 8-10, has gained such popularity that Rachel Miner herself has mentioned in interviews that she is a fan of it.
- Dean called this relationship "Megstiel" in "Goodbye Stranger."