Alias is an American action, drama, thriller, and science fiction television series which debuted on September 30, 2001, on ABC.
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.
A major plotline of the series is the search for and recovery of artifacts created by Milo Rambaldi, a Renaissance-era character with similarities to both Leonardo da Vinci and Nostradamus.
[1] Jennifer Garner reprises her television role of CIA agent Sydney Bristow in this story that takes place between the second and third seasons of the live-action series.
It is considered a "missing adventure" during a period Sydney later erases from her memory in which she works undercover as an assassin named "Julia Thorne."