Four seasons in four seperate discs.
The fourth season contains an episode of Stewie building a ship to morph himself into Peter's body to find his new brother. That show was one of the best from fourth season, aside from the Griffin's using violence as family therapy. What about when Peter found out Lois wasn't really a Kiss fan? That was from the fourth season, as well. Wait, how did I know all of that? Oh, yeah! I have the fourth season on dvd.