Arvin Sloane is the principal antagonist, a cold and calculating criminal mastermind who has the uncanny ability to mix lies with the truth. His central motivation throughout the series is to uncover the endgame of a 14th century philosopher, Milo Rambaldi, whose works have proven to be prophetic and almost clairvoyant.Sloane begins the series as chief director of SD-6, a cell of a terrorist organization known as The Alliance, which poses as a branch of the CIA. After having Sydney Bristow's fianc