Jason Isaacs jokingly described Gore Verbinski's new thriller "A Cure For Wellness" as a "roller-coaster ride" crafted by "demented, twisted people."

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Best known for his performances in "Peter Pan," "The Patriot" and the "Harry Potter" blockbusters, as well as the TV series "Brotherhood," Isaacs plays the mysterious head of a Swiss Alps health spa where nothing is what it seems in "Wellness."

The film co-stars Mia Goth and Dane DeHaan.

"I thought this clearly had sprung from demented, twisted people and I spoke to Gore on the phone and it turned out a lot worse than I imagined. It looked like the kind of film that would be both fun to be in and deliciously excruciating to watch," Isaacs told UPI during a recent round-table interview with reporters in New York.

"Sometimes it's important that we hold the mirror up to nature and sometimes it's important that we have a big, old roller-coaster ride of emotions when watching a film."

"And watching it last night with an audience for the first time -- having seen the film, I watched the audience -- and they went through all kind of gymnastic aberrations. People were cringing, turning upside-down, they were gripping their partners' hands, they were covering their eyes and looking through [their fingers.] I thought it would be a ride. As, indeed, it turned out to be," Isaacs added.

"A Cure For Wellness" is in theaters now.