In seasons 4-6, the maximum prize money offered was one million dollars. Australia is the only country to offer such a prize on Big Brother. Housemate "Trevor" in season 4 is the only person to win one million dollars, as housemate fines were deducted from the prize in seasons 5 and 6.
Housemate "Bree" of Season Four, became the first person in the history of Big Brother to be wrongly evicted and allowed to re-enter the house.