Summary: 8/10: inventive, genre-defying filmmaking that uses monster movie conventions to deliver sharp political critique and genuine emotional resonance.
A U.S. Army coroner orders an underling to dump many toxic chemicals into the Han River. Six years later, a monster crawls out and starts destroying people. If this were an ancient folktale, or even a Bong Joon-ho film (which, of course, it is), the monster would be a metaphor for the anger of the water spirit, nature's violent response to human desecration.
The best part of this movie is the impressive creature design and animation. The creature looks like no film monster before it: amphibious, awkward, surprisingly fast, with a prehensile tail and a mouth that opens in ways that violate every expectation. It's totally creative, a testament to Bong's vision and his creature design team's execution. Joon-ho proves once again his creativity and willingness to surprise the viewer, refusing to give us a Godzilla knockoff or a standard kaiju.
And also, typically for Bong, the film doesn't fit neatly into any genre. Not really horror, not quite a monster movie. It contains elements of horror, comedy, pathos, social commentary, and has something to say not only about the big issue of environmental catastrophe but also about family, loyalty, and the ways ordinary people respond when institutions fail them. The Park family at the center, bumbling, dysfunctional, deeply human, become unlikely heroes not through competence but through sheer desperate love.
Bong's social commentary targets what the U.S. and other advanced civilizations have done to clean water worldwide. The film's opening, based on a real incident of U.S. military pollution in South Korea, sets the stage for everything that follows. The statistics are damning: approximately 50% of assessed river and stream miles across the U.S. (703,417 miles) are classified as "impaired" due to pollution. Agricultural runoff, mostly by agribusiness, is estimated by the USDA to account for 80% of water pollution in U.S. rivers and lakes. Millions of Americans are exposed to forever chemicals. The Host asks what "invisible monsters" are we creating through our carelessness, our arrogance, our willingness to poison the natural world for convenience and profit.