The player is cast as Carrington Institute agent Joanna Dark, whose excellent scores in training have earned her the codename "Perfect Dark".[21] On her first mission, she is sent to extract a scientist named Dr. Caroll from the dataDyne skyscraper.[20] When Joanna rescues Dr. Caroll, she learns that he is an AI who decided to defect from dataDyne after realising that the company betrayed ethical and moral standards.[20] After the operation, Carrington is held captive at his private villa by dataDyne soldiers and forced to tell them where Dr. Caroll has been hidden. Joanna manages to rescue Carrington, who informs her that Dr. Caroll has been taken to the G5 Corporation headquarters in Chicago because he is suspected to be a front for dataDyne.[22] In Chicago, Joanna learns that dataDyne and their conspirators plan to kidnap the President of the United States to get access to a deep sea research vessel called Pelagic II.[23] Despite the President being in danger, Carrington alerts Joanna that a Maian craft was shot down near Area 51 and sends her to rescue any survivors from the base.[24] While inside the base, she rescues one survivor, a Maian protector named Elvis who is key in stopping the conspiracy.[20]