Tidus starts out in Zanarkand where he is set off to start a blitzball game, but is quickly interrupted by Sin. He is joined by Auron to teach him how to fight. In the ensuing encounter, Sin ends up sending Tidus into what is apparently 2000 years in the future.
He then is found by a group of Al Bhed (including Rikku) who help him until he is transported by Sin yet again. This time, he washes up on the shores of Besaid Island where he is greeted by a group of people that explain to him what is going on.