'American Horror Story' season 5 spoilers: Helena Mattsson from 'Mistresses' joins cast

More and more folks are swarming into the hotel, with the latest season of "American Horror Story" casting "Mistresses" star Helena Mattsson. The actress revealed her horror gig by posting a photo on her Instagram account with #americanhorrorstory on the caption. 

Another day at work. Getting ready to film some scary stuff.. #thatsallicansay #americanhorrorstory

A photo posted by Helena Mattsson (@helena_mattsson) on

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According to her IMDB profile, Mattsson will play a character named Agnetha and she will appear in the premiere episode of "American Horror Story: Hotel" titled "Checking In." Unfortunately, other than that, there's no information available that will help fans develop a description or an image of the newcomer. 

It is also unknown if she will only be putting in an appearance in the opening episode. Carter Matt guesses that she will be one of those characters that creator Ryan Murphy mentioned will book a room in the hotel. 

Mattsson is no stranger to the horror genre. Before "AHS," the actress starred in sci-fi horror film "Species: The Awakening," where she portrayed the role of a half-human, half-alien. She also appeared in ABC's fleeting supernatural drama series "666 Park Avenue." 

"American Horror Story: Hotel" will be headlined by Lady Gaga. Other staple cast members in the FX anthology appearing this season are Sarah Paulson (Hypodermic Sally), Kathy Bates (Iris), Evan Peters (Mr. March), and Angela Bassett (Ramona). 

Those whose characters have yet to be revealed include Emma Roberts, Chloe Sevigny, Finn Wittrock, and Wes Bentley. Newcomers include Max Greenfield, Denis O'Hare, Cheyenne Jackson, Matt Bomer (Donovan) and Richard T. Jones (Detective Hahn). 

Murphy told Deadline that the new season is "based in the hotel in horror movies and horror tropes." He added that it will be the same as the show's "Murder House" season "in that when you check into a hotel, there are certain things beyond your control." 

"American Horror Story: Hotel" will premiere in October. The filming for the new season began this month.

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