Man, I've got such a soft spot for that one. 'Utopia' (I'm assuming you mean the UK graphic novel series and not the TV show) is basically this brutal conspiracy thriller wrapped in gorgeous, sickly neon art. The plot kicks off when this bunch of online forum nerds—led by this guy Wilson Wilson, no joke—get their hands on a lost manuscript for a comic called 'The Utopia Experiments.' Turns out, this comic predicts a bunch of real-world disease outbreaks, and now a shadowy organization called The Network is hunting them down to get it. It's a race to decode the manuscript's secrets before a planned global pandemic, The Russian Flu, gets unleashed.
What really sticks with you are the themes, though. It's obsessed with the ethics of population control, asking if sacrificing millions is justified to 'save' the planet from overpopulation. That conflict between ruthless utilitarianism and basic human morality is the engine of the whole story. The art, all those yellows and pinks, makes the violence feel even more shocking and surreal. In the end, it's less about who wins and more about how far you'd go for what you believe is the greater good—and how terrifyingly easy it is to rationalize horror.