The writers wanted Aycox to reprise the role in later seasons, but ultimately cast Rachel Miner for storyline purposes.

Meg slits a man's throat and uses his blood to communicate with her father Azazel, the demon responsible for the death of Sam and Dean's mother.

[2] After Sam and Dean reunite with John and acquire the demon-killing Colt, Meg begins killing their friends in "Salvation" and threatens to continue doing so unless they surrender the weapon.

John delivers a fake gun, but Meg and her demonic brother take him hostage after quickly realizing the deceit.

[3] Meg tracks down the brothers in search of the Colt in the season finale "Devil's Trap", but is ultimately captured and exorcised to Hell.

[4] Meg escapes Hell in the second season and takes possession of Sam (Jared Padalecki) in "Born Under a Bad Sign", seeking revenge against the Winchesters.

After Castiel absorbs damage Lucifer previously caused to Sam's mind, the Winchesters leave a now-insane Castiel in a mental hospital and Meg takes a job at the hospital to watch over him, reasoning that her status as a Lucifer loyalist marked her as Crowley's enemy and it is thus in her best interest to help the Winchesters.

"[17] The word "fiery" summed up the character for actress Rachel Miner, who noted the "devilish enjoyment" that the "obviously very evil" Meg gets from playing cat-and-mouse games with the Winchesters.

[23] Gamble noted that Meg becomes "a bit of a free agent and kind of a demon rebel" following Lucifer's defeat at the end of the fifth season.

[22] Actor Misha Collins, who portrays Castiel, acknowledged that Meg "is still turning up the heat on the sexual tension between Cas and herself" in the seventh season.

[27] The pair are "actually happy to work with one another again" in the eighth season, however, with Collins noting a "remarkably tender moment" between Meg and Castiel that is "unusual for the show".

[29] With the initial episodes of the first season featuring mostly unconnected storylines, the writers became desperate to begin developing a mythology for the series.

[31] Executive producer Kim Manners had previously directed an episode of the series Over There featuring Aycox, and hand-selected her for the role of Meg.

[32] The actress's strategy in "Scarecrow" was to surprise the audience—the episode's conclusion reveals that Meg is a demon—by portraying her as "a truly innocent girl who's lost and on her way to somewhere else".

[15] In designing the costume for that episode, Diane Widas wanted to reflect that Meg was traveling but also dress her as "a girl that the boys would be interested in".

[33] As Aycox became more comfortable on-set and saw how the series leads Jared Padalecki and Jensen Ackles were "playful" and "up for anything", she gained the confidence to bring a "sexuality" to the character.

[33] The character was seemingly killed off in the same episode, a decision that Manners disagreed with because he thought that she had potential to be a "great nemesis" for the Winchesters, akin to the Cigarette Smoking Man of the series The X-Files.

Realizing that demonic possession could explain his actions, the writers brought back Meg because she would want revenge for being exorcised.

[36] For most of the episode, Sam is depicted as "scared, confused, and angry", only to reveal the "characteristic demon swagger" after he takes Jo hostage.

[37] After Meg's disappearance, Kripke repeatedly asked the writers what she was doing off-screen and eventually elected to write her into the fifth season premiere "Sympathy for the Devil" himself.

It's Me, Dean Winchester" as the spirit of the actual Meg Masters—and brainstormed reasons why the demon would want to return to her old host after the body had been buried and rotting for years, but ultimately deemed it too impractical and chose to recast.

Feeling that "when someone dies, you want it to count a little bit", executive producer Jeremy Carver stated that "there are no immediate plans to bring her back".

[49] Similarly, Steenbergen felt Miner played the role "with vicious flair" and "[conveyed] Meg's brutality well, right from the beginning".

Farley wrote, "As a demon turned good (sort of) she occupies a moral grey zone that leaves her actions completely unpredictable even after year’s [sic] of guest appearances, a refreshing quality for a character to have.

Laura Prudom of Huffington Post felt Aycox portrayed the character with a "lot more subtlety" than Miner and preferred Meg's darker appearances prior to Miner, finding it "hard to reconcile the demon who possessed Sam and went on a killing and torture spree in the phenomenal 'Born Under a Bad Sign' with the character we've seen in the past couple of years".