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.
Quest roles:
Patrick Warburton(Joe Swanson (uncredited) (archive footage) (voice)), Adam West(Mayor Adam West (voice) (archive sound)), H. Jon Benjamin(Bob Belcher (voice)), Alexandra Breckenridge(Hudson's Mother (voice)), Joe Flaherty(Vatican Messenger (voice))