"Alias" is a show about Sydney Bristow, a secret agent who believes that she works for a secret branch of the CIA called SD-6. After having her fiancé killed by them, she discovers that she is actually working for the enemy she thought she had been fighting and makes her personal mission to take them down.
With different languages, locations and costumes in every episode, "Alias" is the first show I have been addicted to and the first I have ever loved. Even though it went downhill in its final seasons, "Alias" is action-packed, well acted and most of all, entertaining and (hopefully) will not disappoint you. The first two seasons are among the best I have ever seen and you will be addicted to it in no time. Keep your mind open for eventual plot holes and enjoy. :)