Following the two posters released yesterday, A24 Films have released domestic and international trailers along with a third poster for the sci-fi thriller Ex Machina, which marks the directorial debut of Alex Garland, the writer behind 28 Days Later, Sunshine and Dredd 3D.Domhnall Gleeson stars as Caleb Smith, a talented a programmer at a massive internet-search company, who wins a competition to spend a week at the private mountain estate of the company's brilliant and reclusive CEO, Nathan Bateman (Oscar Isaac).