Thinestra is directed by Nathan Hertz and the cast includes Michelle Macedo, Melissa Macedo, Mary Beth Barone, Annie Ilonzeh, Gavin Stenhouse, Shannon Dang, Brian Huskey and Norma Maldonado.
Identical twins Michelle and Melissa Macedo play the central roles, capturing both sides of Penny’s horrifying transformation.
TL;DR: A photographer’s assistant takes a secret weight-loss drug, gets quick results, and then completely loses control when a second version of herself starts wrecking her life - strong concept, solid execution, but it leans on familiar ideas, but still worth it if you like messy body horror.
A Bad Idea That Feels Way Too Easy to Make
So, a photographer’s assistant working in a high-end fashion space gets access to a weight-loss drug that absolutely should not be circulating casually but of course, she takes it.
This is also one of those polished, high-fashion worlds where everyone looks like they were assembled rather than born, and nobody directly tells her she’s not enough, but they don’t need to, as it’s already built into the space - she moves through shoots and fittings surrounded by people who seem completely at ease in a system she’s constantly struggling to keep up with.
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The Glow-Up Phase (Before Everything Breaks)
At first, the drug works, because of course it does - weight drops, confidence goes up, and suddenly the same world that ignored her starts responding differently, and there’s a stretch where everything feels… manageable.
The film doesn’t rush this part, which helps, as it lets the improvement settle just long enough for you to start expecting the fallout, and eventually, things stop being controlled.
The changes don’t hit all at once either, they creep in with small slightly wrong moments that build into something harder to ignore, before the film then commits, because a second version of her shows up - and that’s when it stops being manageable.
Double Trouble and a Life Falling Apart
Once the duplicate is fully in play, everything starts collapsing in stages - work becomes unstable, relationships start cracking, and every attempt to explain what’s happening just makes her sound less believable.
There’s also something almost darkly funny about how quickly things spiral, where it feels like the kind of spiral where nothing goes right all at once, and there are moments where she’s trying to justify what’s happening while realizing mid-sentence how it sounds, and that loss of control is where the film is at its strongest.
It also gets violent at times, too, and I actually felt a lot of empathy for Penny as well, despite some of her choices, and the themes at play are managed pretty well overall.
Familiar Territory, Just Reworked
This is where it gets a bit split.
The execution is solid as said, and the film is fairly engaging, but the core ideas aren’t exactly new - split identity, body transformation, external pressure turning internal - it’s all territory that’s been explored before.
That doesn’t make it bad by default of course, but it does mean you can see certain beats coming, so you’re less surprised and more curious about how far it’s willing to push things, but I did wish it had some new fresh ideas thrown in, even if some of the themes are handled quite well.
Final Thoughts
This ended up being more engaging than expected, mainly because it commits to its premise once it gets going, but it just doesn’t fully escape the feeling that you’ve seen versions of this story before.
But if body horror mixed with identity breakdown is your thing, there’s enough here to make it worth the watch if you go in with the right expectations.