Sara Bennett is a visual effects artist that worked on what 2015 film directed by Alex Garland?
Sara Bennett:  Best known for her works in "Harry Potter and the Chamber of Secrets" (2002), "Harry Potter and the Prisoner of Azkaban" (2004), "Harry Potter and the Goblet of Fire" (2005), "Doctor Who" (2005), "Merlin" (2008), "Jonathan Strange & Mr Norrell" (2009), "Skellig" (2009), "The Martian" (2015) and "Ex Machina" (2015). Ex Machina (film): Ex Machina (stylized as ex_machina or EX_MACHINA) is a 2015 independent science fiction psychological thriller film written and directed by Alex Garland (in his directorial debut) and stars Domhnall Gleeson, Oscar Isaac and Alicia Vikander.
Ex Machina