Catch up TV on Big Brother. Watch the latest and all other episodes of Big Brother now online, broadcasted on Nine. Catch up on your favorite Nine TV show: Big Brother. Replay tv on its best! A group of people selected from a national search share a House sealed from the outside world for up to 100 days. Watching over these Housemates is Big Brother - heard only via a fatherly voice. He is the all-seeing all-knowing authoritarian figure who monitors the Housemates' every move.