Debbie Day for Rotten Tomatoes: It s interesting what you said about Pan s Labyrinth gutting you and then Strictly Ballroom bringing you absolutely absolute joy, because it reminds me of Saint Maud and David Copperfield; they re complete opposites, and Saint Maud very much gutted me, and then with David Copperfield, I couldn t keep the smile off my face.Clark: Yay, that makes me so happy, [to hear] people talk about Copperfield like that because that s what Armando wanted to do, he wanted give people a film that would just make them love everyone and everything and make them really happy and that kind of stuff. It seems to be what s happening and it is just so lovely.You played two roles in that.Clark: I did. Which I only auditioned for one of them and then had lunch with Armando before he cast me just to kind of meet me, because he likes to meet people and see if you connect with them — not only just send a tape — and then he s like, So we want you to play Clara as well. And then I had to go through this whole meeting kind of being like, I need to scream. Ahhhh! I can t believe this has happened. But yeah, that was really lovely, and it was also meant that I acted with Jairaj [Varsani], he played young David Copperfield. He was just wonderful.That was a beautiful beautiful relationship on screen. Did Armando make that choice to have you play both roles so that it gives Dev s David Copperfield more reason to connect with Dora?Clark: Yeah, in the book he says that Dora is a lot like his mother and kind of reminds him of his mother, but also it s kind of the idea that he s constantly trying to kind of find what he s lost and what he once had, and so when he meets Dora it and there is like big similarities, he s like, I must grab that because that s something that was gone from me. And then you kind of obviously realize that doesn t mean that it s right. I think David s constantly trying to get back what is now gone instead of trying to make a new world, and Dora represents that kind of stuff and is amplified by being played by me.(Photo by A24)I know you ve done horror before, but can you tell me what drew you to Saint Maud?Clark: I am really obsessed with the health service. I have lots of family who work in it, but also just kind of constantly was watching 24 Hours on A E, 999: What s Your Emergency, and One Born Every Minute. I find the idea that the people who want to care for people most are in a situation — because of money, stress, and work hours — are kind of being broken and that is so sad and just wrong. And so immediately when I started reading it and realized she was a nurse and she just kind of experienced burnout, I was like, I care about this, I care about her, and it shouldn t have happened, but I want to protect her. So it kind of immediately made me care about her.Did you read the script and think, Oh my God, I have to play this role?Clark: I think it s more that I read scripts am sometimes like, Oh my gosh, I have no idea what to do with this. I would be really bad at that. When I read Maud I was like, Oooo, I think I could do this actually. I think I d know why she did these things. I think I d understand her. There s so many moments that you re like, Oh my God, I can t believe that has happened, but equally like, Of course that happened. So this is happened to Maud, then this and this and this, and this has happened to Amanda. And so I found the kind of amazing juxtaposition that Rose manages to get in terms of … kind of making the extreme mundane and ordinary and normal and make perfect sense is really kind of interesting to me.And I also read it being like, Oh, there re no scenes in this that I ll be terrified to film. Because the ones I m terrified to film are always ones that I just can t quite make sense of or quite understand, and there was huge clarity of who the woman was and why this story happens. So I think that s what it was: I kind of felt that I wouldn t be terrible.Is the horror supposed to be real or is it supposed to be in her mind?Clark: Rose did a lot [of research] about how saints possibly had mental illnesses, like Joan of Arc. There re those really interesting podcasts about it. There s a particular type of thing that can happen in the brain that you get these very vivid hallucinations.So my last question is: Are you as excited to be in The Lord of the Rings as fans are to see it?Clark: Oh my gosh, I m such a Lord of the Rings fan, I can t tell you. I have this really clear image of telling everyone to leave me alone while I was reading The Hobbit at year six. And then I ve watched those films so many times, and I think that it s been very hard to reconcile this with the idea this is actually happening, because it s just crazy to me that I am in it, because I d have been so excited just to watch it.Read More: Everything We Know About The Lord of the Rings Amazon Series I m just thrilled for you. It s a really exciting time with these films and your role in Lord of the Rings. It seems like a wonderful time in your career.Clark: Thank you. I am starting to kind of allow myself be like, It s all kind of working out. Enjoy it.Thank you so much for taking the time to talk to me. Keep healthy and safe.Clark: I know. It was making me think of all these cool nurses and doctors working so hard. I just really want them all to be OK.Saint Maud releases in U.S. theaters today and will be available on Epix starting February 12; The Personal History of David Copperfield is available to rent and buy through most major streaming video-on-demand services; The Lord of the Rings will stream on Amazon Prime Video.On an Apple device? Follow Rotten Tomatoes on Apple News.