Alias is an American action thriller television series created by J. J. Abrams, that was broadcast on ABC for five seasons from September 30, 2001 to May 22, 2006. It stars Jennifer Garner as Sydney Bristow, a double agent for the Central Intelligence Agency posing as an operative for SD-6, a worldwide criminal and espionage organization.
The main theme of the series explores Sydney's obligation to conceal her true career from her friends and family, even as she assumes multiple aliases to carry out her missions. This theme is most prevalent in the first two seasons of the show. A major plotline of the series is the search for and recovery of artifacts created by Milo Rambaldi, a fictitious Renaissance-era figure with similarities to both Leonardo da Vinci and Nostradamus. This plot, and some technologies used in the series, place Alias into the genre of science fiction.
The series was well received among critics and has been included in several "best of" lists, including the American Film Institute's top ten list for television programs in 2003. The show also received numerous awards and nominations.