Family Guy - Season 7 Episode 4 Baby Not On Board Parental Discretion Advised, that's how you know it's good.
Overview: Peter gets a lasting supply of gasoline for the year, so the family decides to use it to take a road trip to the Grand Canyon. They pack up and hit the road, but it takes them a while to realize that they had forgotten to bring Stewie with them; when they do, they must make their way home posthaste.