Evan Peters, John Carroll Lunch in "AHS: Hotel"

The cast of “American Horror Story” is already enormous, but it practically doubled in size for the show’s Halloween — well, “Devil’s Night” — episode. Evan Peters’ character, J.P. March, is more than just the creator of the fictional hotel. He’s also based on the real serial killer H.H. Holmes, who built a hotel in Chicago during the World’s Fair.

But March/Holmes invited over some real — as in, real-life — killers to the fictional Hotel Cortez to celebrate “Devil’s Night,” the Oct. 30 holiday that celebrates everything wicked in advance of Halloween.

RICHIE RAMIREZ IN "AHS: Hotel"

To begin, Richie Ramirez, known as the Night Stalker, killed over a dozen people, and raped or burgled two dozen more in California during the 1980s.

He was known for breaking and entering Californians’ homes, which is why he seemed to thrill in breaking into the hotel from the outside.

RELATED: Who’s the biggest ‘AHS’ threat? The ‘Hotel’ cast weighs in

Those tattoos on his hands were Satanic pentagrams, and he probably did a lot to fuel the Satanic Panic crazy. Interestingly, even though he died in 2013, the character looked like he did when he was stalking and killing his victims in 1985.

Humorously, the Zodiac Killer remained just as mysterious at the banquet as they are in real life — the identity of the Bay Area murderer remains a mystery.
John Carroll Lynch as John Wayne Gacy in "AHS: Hotel"

Executed in 1994, John Wayne Gacy was a local clown in his native Chicago, and his affable exterior concealed a dark side of childhood abuse and repressed homosexuality. Gacy was responsible for killing 33 men and boys and hiding them in his basement — which is probably why he felt qualified to give the rest of the killers tips on home improvement.

In an interesting twist, Gacy was played by John Carroll Lynch, who portrayed another serial killer clown, Twisty, in Season 4 of “AHS” as well as playing the chief suspect in “Zodiac,” about the Zodiac Killer investigation.

Quietly creepy at the “Devil’s Night” banquet, Jeffrey Dahmer was a serial killer in Milwaukee who cannibalized his victims, hence his constant comments about his appetite.

RELATED: First ‘AHS’ cast trailer takes viewers into the halls of the ‘Hotel’

Dahmer specifically targeted men and teenage boys, and his treatment of the victim March quite literally brought to the table served as one of the most unsettling moments in the show’s history — power tools will never be the same.

Lily Rabe as Aileen Wurnos in "AHS: Hotel"

Aileen Wurnos, known as the most infamous female serial killer, had her story described in pretty accurate detail on the show. She killed men whom she alleged had tried to assault her while she was working as a prostitute, but was convicted and given the death penalty for their murders — but not before she sold the movie rights to her story, which was adapted into the film “Monster” in 2005.

Wurnos was not known for her dance abilities, but if Lily Rabe is playing a part on “AHS,” there has to be at least one scene where she dances.

Wes Bentley as John Lowe on "AHS: Hotel"

And the last member of the banquet was John Lowe, who may have seemed innocent, but clearly has some form of latent danger to him, or this group of killers would have never deigned to dine by his side. John might very well find out that he’s the one who’s been committing these inexplicable Commandments murders.

Posted by:Kayla Hawkins