The show premieres at 10 PM Tuesday, August 7, after the Season 5 premiere of Bachelor in Paradise. Watch the first-look trailer above. In what feels something like Survivor-meets-an unscripted Lost, Castaways follows 12 diverse individuals — "strangers torn from their ordinary lives,"" the trailer stresses — as they are dropped alone throughout various islets in Indonesia and challenged to survive among washed-up luggage, scattered resources and abandoned structures.