•  Ryan Murphy and Lady Gaga arrive at the Premiere Screening Of FX's 'American Horror Story: Hotel' at Regal Cinemas L.A. Live on October 3, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

Ryan Murphy and Lady Gaga arrive at the Premiere Screening Of FX's 'American Horror Story: Hotel' at Regal Cinemas L.A. Live on October 3, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images) (Photo : (Photo by Jason Merritt/Getty Images))

"American Horror Story: Hotel" (AHS) Season 5 is set to air Halloween themed Episode 4. The forthcoming episode is appropriately titled "Devil's Night" and will see Detective John Lowe (Wes Bentley) sit down for dinner with some real-life serial killers. The show will introduce Lily Rabe's character Aileen Wurnos, one of the well-known serial killers of all times and John Carroll Lynch's character John Wayne Gacy. Check out the spoilers and promos for the special episode of FX's horror show below. Read on to find out everything that you need to know. Also, learn where to watch the Halloween-themed segment online through live stream.

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[Spoiler alert! This article contains spoilers for "American Horror Story: Hotel" (AHS) Season 5 Episode 4 "Devil's Night." Read further only if you want to explore more about it.]

Thing are only going to get terrifying in the Hotel Cortez, when on the night of Halloween, its psychopathic owner James March will host a dinner party for the hotel residents and others. In an interview with Entertainment Weekly, "American Horror Story: Hotel" (AHS) creator Ryan Murphy revealed that the special Halloween-themed episode will be a two-part segment.

Season 5 Episode 4 "Devil's Night" will have all the elements essential to Halloween. According to the showrunner, in part one of the Halloween-theme segment, John Lowe will find himself in the room full of real-life serial killers including James March, Aileen Wurnos and Gacey.  

"The biggest serial killers of all time all come to the hotel. Gacey. Aileen. John Lowe's invited to a devil's night dinner. He thinks someone is pulling a huge prank on him. It's the biggest serial killers of all time in a room with him and he has to figure who is trying to make him lose his mind," Ryan Murphy told the abovementioned publication.

Fans can expect more surprises in "American Horror Story: Hotel" (AHS) Season 5 Episode 4 "Devil's Night." As noted by Murphy, part two of the Halloween special will see the arrival of Darren Criss' character. While the name of the character still remains unknown, it is said he is portraying the role of a "hipster," who checks in the Hotel Cortez with his girlfriend to avoid trick-or-treaters.

"They're horrified they can't get their artisanal cheese and they hate the sheets and they put Iris [Kathy Bates] through the wringer and she's not happy," Murphy said about the couple arriving at the Hotel Cortez.

Meanwhile, the synopsis for "American Horror Story: Hotel" (AHS) Season 5 Episode 4 (via TV.com) also suggest that Alex springs into action and tries to diagnose her son Holden's condition. Fans will remember that Scarlett discovered her brother alive in Episode 2 of the series Will Alex be able to help Holden? Will she take her back home?

A promo video for "American Horror Story: Hotel" (AHS) Season 5 teases the events of Halloween special segment Episode 4 "Devil's Night." It shows James March making a toast to the "greatest killers of all times" at the dinner party, while John Lowe wonders if someone is tricking him. Scroll down to watch the promo.

"American Horror Story: Hotel" (AHS) Season 5 Episode 4 airs on Oct. 28, 2015 at 10:00 pm on FX. Fans can also watch "Devil's Night" online via FX apps and fx.com. Meanwhile, stay tuned for more spoilers and updates for Episode 5 titled "Room Service."