Season 0 of Alias premiered on null.

Season 1

8.2

.

2001

.

22 Episodes

The first season of Alias premiered September 30, 2001 on ABC and concluded May 12, 2002 and was released on DVD in region 1 on September 2, 2003. Guest stars in season one include Sir Roger Moore, Terry O'Quinn, Quentin Tarantino, and Gina Torres. Apart from Truth Be Told, the episodes of Alias are often unconventionally structured in that the title credits are usually shown well into the plot, almost as an afterthought. Also, usually a plot finishes at mid-episode and a new plot begins, so that every episode finishes with a cliffhanger. The impression thus created is that an episode will conclude the previous one and plant the seeds of the next one.

Season 2

8

.

2002

.

22 Episodes

In the second season, plotting against rogue agency SD-6 keeps superspy Sydney Bristow almost as busy as negotiating a relationship with her long-lost mother and dealing with her growing feelings for CIA handler Vaughn. What Syd doesn't know is that there are lots more changes (costume and otherwise) ahead of her... it's going to be a long year!

Season 3

7.9

.

2003

.

22 Episodes

Thrown for a serious loop in the final episode of season 2, CIA agent Sydney Bristow starts season 3 dealing with a life -- and memory -- left in shambles. Luckily she has her resourceful father and her trusty partner to offer assistance as she searches for the truth. But a new double agent may be closer -- and more dangerous -- than Sydney suspects.

Season 4

7.8

.

2005

.

22 Episodes

The action explodes in the phenomenal fourth season when Sydney leaves the CIA to join a powerful new Black Ops unit, having no idea of the reunion in store for her.

Season 5

7.8

.

2005

.

17 Episodes

The final season kicks off with a shocking revelation and never lets you catch your breath as superspy Sydney Bristow faces one mother of a challenge. Old enemies and favorite guests return for the action-packed series finale.