Actor Mark Ruffalo has earned big coin and an even bigger fanbase playing the Hulk, but to his six million followers on Twitter, he's more of a superhero for the environment.
Political and outspoken, his latest movie feels personal - it's the story of the Du Pont chemical poisoning scandal, and it's called Dark Waters.
Twenty years ago Julia Roberts won an Oscar for Erin Brockovich, a true story based on a woman who took on a massive American power company knowingly poisoning the water in her town. At that same time, one of the world's largest chemical conglomerates, DuPont, was doing exactly the same thing.
Now, we have the true story of the lawyer who spent that same two decades trying to expose them.
Robert Bilott's specialised in environmental law. He represented some of the biggest chemical companies in America, including Teflon giant Du Pont
But when an old family friend asks for his help, he will be called upon to do the exact opposite; to side with the plaintiff, not the corporation.
What he slowly uncovers is the stuff of nightmares and on the big screen as a feature film, it's just as horrific.
Ruffalo's performance is without a whiff of Hollywood histrionics, fuelling the authenticity and delivery of the bare facts of the case in a story which needs little embellishment to render it vital viewing, and a high impact call to action.
Patient, procedural, potent, I urge you to take the dive and swim these Dark Waters. You may feel the need for a scalding hot shower afterwards and even then you might find yourself wondering what was in the water.
Four-and-a-half stars.
