"Peter wins a year of unlimited gas, and Brian suggests that the family use the funds to take a road trip to the Grand Canyon. So the Griffins pack up the car and hit the road, but leave some very precious cargo at home. When the family finally realizes that they have left behind one of their own, it’s a mad, explosive, hilarious dash back to Quahog."
Please don't take it off, we can't be changing the summary when the episode airs in two days.
Edit
I edited the page slightly to make it somewhat longer, but it could still use more work.
Edit
I edited the page slightly to make it somewhat longer, but it could still use more work.