Delivering the apocalypse on a budget, the disaster film Greenland dramatises the end of the world with no-nonsense efficiency. Gerard Butler’s sturdy performance is perfectly suited to the modest proceedings: Playing a husband and father trying to protect his family as a doomsday comet rockets toward Earth, the B-movie star exudes just the right amount of weathered weariness and rumpled vulnerability. Those hoping for the spectacle of a 2012 or the swagger of an Armageddon will be disappointed, but director Ric Roman Waugh gives the story a consistent tautness, which helps make up for the familiar trappings and occasionally convoluted plotting.