"That's Entertainment" (2019) Alastor made his first full appearance in "
That's Entertainment", the
Hazbin Hotel pilot episode. Presented as an overlord of Hell, Alastor visits the "Happy Hotel" after witnessing Charlie Morningstar's televised interview about the establishment. He offers his services to help run the hotel, and states that he believes redeeming sinners is an impossible task, and he is only there to watch people try and fail to redeem themselves for his own entertainment, due to boredom with his own life. He summons two sinners, Niffty and Husk, to serve as the hotel's maid and bartender, respectively. After renovating the hotel in a musical number ("Alastor's Reprise"), Alastor uses his power to fend off an attacking Sir Pentious, before renaming the hotel the "Hazbin Hotel".
"A Day in the Afterlife" (2020) Alastor returned in a starring role in "A Day in the Afterlife" (alternatively titled "The Radio Demon"), an official
webcomic published on October 19, 2020. The comic explored a typical day for Alastor at an unspecified point in his afterlife. While attempting to purchase venison from a butcher, Alastor witnesses the butcher attempting to kill a sinner. He saves her life and consumes the butcher.
Hazbin Hotel (2024–present) Season 1 (2024) Alastor assists Charlie in running her redemption hotel. In "
Overture", one week after the events of the pilot, Alastor notes it to have been "some time" since he was active in Hell. In "Radio Killed the Video Star", after Alastor fends off another attack by Sir Pentious, Alastor's rival Vox learns that Alastor has returned, noting that Alastor has been absent for seven years. After losing a broadcast debate with him ("
Stayed Gone"),
Vox and the other "Vees" (Velvette and Valentino) seek to prevent Alastor from making a deal with Charlie, and send Sir Pentious into the hotel to spy on him. In "Scrambled Eggs", Vaggie asks Alastor to look after Sir Pentious' egg minions, which he allows to accompany him to a meeting with the other overlords of Hell. After Velvette insinuates at the meeting that Carmilla Carmine killed an angel during the last Extermination (an annual purge of the souls of Hell by Heaven's army, led by
Adam), Alastor orders one of the egg minions to spy on Carmilla and confirm this claim to be true. The egg returned soon after with confirmation. In "Masquerade", Husk is revealed to have once been an overlord of Hell, who made a deal with Alastor to keep his power in exchange for his soul. In "Dad Beat Dad", after Charlie's father Lucifer arrives at the hotel and isn't impressed, he clashes with Alastor over who is the better father figure to Charlie ("
Hell's Greatest Dad"), before being interrupted by Alastor's friend Mimzy. Distrustful of Mimzy, Husk takes Alastor aside to remind him not to trust her motives. On being brushed off as a "pet", Husk mentions how Alastor is "on a leash" to someone else, which Alastor threatens him never to mention again. After several
loan shark demons attack the hotel in search of Mimzy, Alastor uses his powers to kill them and remind Hell of his power, before ordering Mimzy to leave. In "Hello Rosie!", following Charlie failing to pitch the hotel to Heaven again, with one month to go until the annual Extermination, Alastor convinces her to make a deal with him, telling her about Carmilla killing an angel, in exchange for a binding future favor. After Charlie sends Vaggie to acquire information from Carmilla, Alastor brings Charlie to see his friend Rosie, the overlord of Hell in charge of Cannibal Town, and they convince the cannibals to serve as an army to defend the hotel against the angels ("Ready for This"). In "The Show Must Go On", the night before the Extermination, Alastor reminisces on the previous six months with Niffty, noting that one "could get used to" the residents of the hotel. On the Extermination's arrival the next day, a war between the angels and sinners ensues, and Alastor faces Adam himself. Overconfident, Alastor is badly wounded by Adam and forced to flee; in the aftermath of the battle, as the Vees celebrate Alastor's assumed loss and plot to take over Hell, a desperate Alastor hopes for freedom from his previous deal and control over Hell, before cleaning himself up "with a smile" and reuniting with Charlie and her friends ("Finale").
Season 2 (2025) Alastor's backstory is revealed in "It's A Deal". Prior to his death, he was a
radio show host and
serial killer in
New Orleans in the early 20th century. He made a deal with Rosie before he died, asking her to grant him the power to be the most powerful sinner in Hell. She allows this, under the condition that his soul will belong to her until he does something for her in return. He dies shortly after this deal is struck, being shot by a
hunter who mistook him for a
deer while Alastor was hiding a body in a forest. In the present day, Alastor continues to assist the hotel. In "It's A Deal", he gets into a battle with the Vees that goes poorly, ending in Alastor striking a deal with Vox, wherein Vox will own Alastor so long as the former leaves the hotel alone and doesn't touch Charlie again. In the season finale "Curtain Call," Alastor asks Charlie to do him the favor of saying that Vox is the strongest sinner in Hell, using his favor gained in season one. This frees Alastor's soul from his deal with Rosie, which is now void, as he is not the strongest sinner in Hell. Vox then briefly touches Charlie's shoulders, freeing Alastor from his deal with Vox as well due to wordplay. The two battle, and Vox is eventually defeated. Alastor returns to the hotel once more, though his intentions have changed, as he is no longer bound by any deals. He is seen eyeballing Lucifer; knowing now Lucifer can't harm sinners despite being the king of Hell. ==Promotion and reception==