Volume 4 was split into seasons 4 and 5 in regions outside the United States, leading to confusion over season numbers between U.S., Australian, and UK consumers. The first half of the season is included within the volume 3 DVD box set, which was released on November 29, 2005, and the second half is included within the volume 4 DVD box set, which was released on November 14, 2006. Family Guy 's fourth season aired on Fox from May 1, 2005, to May 21, 2006, and consisted of thirty episodes, making it the longest season to date.
