There are dumb movies that think themselves smart, and there’s smartly conceived trash like Colony, which re-unites South Korean genre virtuoso Yeon Sang-ho with the undead. Following his loosely connected zombie trilogy of Train to Busan, Seoul Station, and Peninsula — the former of which set the world on fire, and is all set for a Hollywood remake — Yeon zigs in a brand-new direction, with a goofy action-thriller that zags at every turn, and makes its sprinting dead the