It's time for the Five Year Creator Reunion Picnic, where imaginary friends' creators come to Foster's to see their imaginary friends. However, once again, Wilt's creator doesn't show up. So he sets off on a cross-country journey to find his creator. But soon Mac and the gang find out that Wilt had gone missing and set out on a road trip to find him. But Bloo's ridiculous theories of to Wilt's disappearance leads to many twists and turns in the journey to find Wilt. Will Wilt ever find out why his creator doesn't show up? Will Mac and the gang find Wilt? Will the lot make it out in one piece?