'Big World' is a transcontinental odyssey about a young man, Tommy, in search of his half-brother. Unclear of his whereabouts, Tommy travels to Indiana to meet his paternal grandfather, Jack, for the first time. The two spend the day getting to know more about each other, in addition to Tommy's half-brother. Discovering that sometimes it's better to let sleeping dogs lie, Tommy and Jack's reunion doesn't go exactly as planned.