Fans often use M4B versions of Family Guy to listen to episodes like a podcast or audiobook while commuting or working.

In the episode "Petarded," Peter Griffin takes an I.Q. test and is officially declared intellectually disabled.

Loretta Brown leaves the cast after divorcing Cleveland, and Peter starts his long-term career at the Pawtucket Brewery.

Aired from May 1, 2005, to May 21, 2006, Season 4 is the in the show's history, consisting of 30 episodes . This season introduced several legendary storylines and character developments: