India, June 19 -- Let's be real; nothing will ever hit like that first Train to Busan watch. But filmmaker Yeon Sang Ho clearly isn't trying to copy himself. With the new Korean movie Colony, released in theatres this week, the director returns to the outbreak thriller with an entirely new set of rules. This time, he traps everyone inside a Seoul skyscraper rather than on a train. And his zombies are not mindless. They actually think. Together. Like a hive. These aren't stumbling, isolated predators; they coordinate, adapt, and swarm like a hyper-efficient insect colony.

The film wastes zero time setting up its nightmare. It begins at a Seoul corporate showcase where Seo Young Cheol (Koo Kyo Hwan), a vengeful biologist who was just fired...