Heather Graham says Tom Felton brought laughs to the They Will Kill You with original ukulele songs about the film's cult
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Lead actress Zazie Beetz endured intense 12-hour filming days, and Felton used music "to entertain her," Graham says
Graham and Felton star in the new horror film as satanic cult members, who are battling Beetz' character
One thing aboutTom Felton? He's going to bring music to a movie set!
Speaking with PEOPLE about their new movieThey Will Kill You,Heather Grahamrevealed that the "iconic"Harry Potteralum, 38, was a delight to have on set. According to the actress, whoplayed a satanic cultist alongside "charming" Felton, the actor always brought his instrument to set and used it to lighten the mood.
"He brings his ukulele to work and he sings a song about joining a cult. He was making us all laugh. He's really funny," Graham, 56, told PEOPLE of her scene partner while speaking alongside costarMyha'laafter the film's premiere atSXSW 2026.
While getting musical behind the scenes of the Tarantino-esque horror flick, the actor (who also makes music!) would give special attention to lead actressZazie Beetz, who had the most intense filming days of the star-studded cast. (The shoot left her "stripped raw" andincluded 12-hour days drenched in "freezing cold water,"she told PEOPLE.)
"He was trying to entertain Zazie, who was really tired," Graham said of Felton. "Obviously, she has so much action, but he was singing the song like, 'The cult's not that bad. Just join us.' I don't know. It was making fun of how ridiculous the cult is, basically."
On working with Felton more generally, Graham says he was a "great actor" — and played it cool about working with theBoogie Nightsactress until well after they wrapped.
"I mean, he's an iconic person. He's a mixture of being a really great actor, funny [and] interesting," she tells PEOPLE. "It's funny because last night at the premiere, he was like, 'Well, I was so excited to work with you,' but he seems so cool. I never really got that when we were working together."
Myha'la, 29, then chimed in to joke that Felton "was keeping it tight."
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They Will Kill Youfollows Asia Reaves (Beetz), an ex-convict who "must survive the night at the Virgil, a demonic cult's mysterious and twisted death-trap of a lair, before becoming their next offering in a uniquely brazen, big screen battle of epic kills and wickedly dark humor," per an official synopsis.
The entire cast — which also includesPatricia Arquetteand Paterson Joseph — was enthusiastic about the horror-action flick from the very beginning, director and co-writer Kirill Sokolov told PEOPLE.
"I think it's such a different and unique thing that people who read the script, they just got excited and they believed in it," said Sokolov, who co-wrote the genre-blending movie with Alex Litvak. "And then we started casting it, and every single person I talked to just somehow got it, and had so much passion and was so excited to do it."
"Also for them, it was interesting because they didn't do it before," the director said of the cast. "It's such a cool thing when you deal with actors like Zazie or Patricia or Myha'la or Tom Felton or Heather Graham who are very experienced and they're masters of their work and they had, like, such long careers and you bring them something that they never tried before."
The child-like "passion" and "excitement of getting there and trying to do something new," he added, was the "best honor for me."
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They Will Kill Youis in theaters now.
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