Which season and episode is the one were Stewie goes forward in time and sees his older self??

That is part of the movie, Stewie, the untold story

2nd season? i dont know, but ive seen the episode.

the end of the second season i think... part of stewie griffin - the untold story, he meets his older self in part 2, then you get to know him in part 3, where you find out meg has a sex change, chris gets married, stewies a virgin and lois is still alive :)

Its a trick question. It wasn't a season it is the movie (stewie griphin the ontold stories.)

Its three different episodes in season four, titled: "Stewie B. Goode," "Bango Was His Name, Oh!," and 'Stu and Stewie's Excellent Adventure." Its also in the movie "Stewie Griffin: The Untold Story"

The Big Bang Theory