Man, everybody laughed and said it was too risky when Louis Koo wanted to make this movie, but hot dang it is one of the best - if not the best - chinese sci-fi movies made in recent memory. The special effects do range between convincing to a little awkward in some scenes, but overall this is awesome and full of incredible action set pieces that I would say are near-Hollywood quality. The story is something that we’re already seen before. Humanity has ruined the atmosphere and made the air toxic, and to top it off a meteor falls onto Earth in district B12 and an alien plant life form sprouts from it uncontrollably every so often, threatening life on Earth. Sure, many common tropes are in play here and recycled, but it is done here very well is a roster of huge HK stars to carry it. I had a lot of fun watching it and it is worth rewatching in future for the great action