Are we there yet? Are we there yet?? Are we there yet??? Homer drops Bart and Lisa off at an amusement park for the day, but it's not until he is long gone that they realize that the park is abandoned and that their thirst for adventure is about to be replaced by the threat of survival. Then Bart, Lisa, and Milhouse find themselves at the end of their rope, if only they can find a way to turn back the clock!