High Quality Content by WIKIPEDIA articles! Julian Sark is a recurring fictional character portrayed by David Anders on the ABC television series Alias. The series follows Sydney Bristow, an operative working for an organization called SD-6 which she believes is a covert branch of the Central Intelligence Agency. However, she learns it is actually a subsidiary of the Alliance of Twelve, a crime syndicate which seeks to make profits from stolen intelligence and artifacts. Upon learning the truth Sydney offers her services to the CIA as a double agent with the intention of destroying SD-6 from within.