Big Brother 4 is the fourth season of the reality television series Big Brother. The format of the program remained largely unchanged from previous seasons: a group of contestants, referred to as HouseGuests, are enclosed in the Big Brother House under the surveillance of cameras and microphones. Each week, the HouseGuests vote to evict one of their own until two HouseGuests remain on finale night. The winner will be decided by the last seven evicted HouseGuests, collectively known as the Big Brother Jury. Julie Chen returned to host this season. The winner of the series won a $500,000 grand prize, while the runner-up won $50,000. This season was also broadcast on E4 in the United Kingdom, beginning near the end of that country's fourth series. Format HouseGuests are sequestered in the Big Brother House with no contact to or from the outside world. Each week, the HouseGuests take part in several compulsory challenges that determine who will win food, luxuries, and power in the House. The winner of the weekly Head of Household competition is immune from nominations and must nominate two fellow HouseGuests for eviction. After a HouseGuest becomes Head of Household, he or she is ineligible to take part in the next Head of Household competition. HouseGuests also take part in food competitions in which they must win in order to eat regular foods. Losers of the competition are put on a peanut butter and jelly diet. The winner of the Power of Veto competition wins the right to save one of the nominated HouseGuests from eviction. If the Veto winner exercises the power, the Head of Household must then nominate another HouseGuest for eviction. On eviction night, all HouseGuests except for the Head of Household and the two nominees vote to evict one of the two nominees. This compulsory vote is conducted in the privacy of the Diary Room by the host Julie Chen. In the event of a tie, the Head of Household must publicly cast a deciding vote to resolve a tie. Unlike other versions of Big Brother, the HouseGuests may discuss the nomination and eviction process openly and freely. The nominee with the greater number of votes will be evicted from the House on the live Thursday broadcast, exiting to an adjacent studio to be interviewed by Chen. HouseGuests can be removed from Big Brother for any rule violation or exhibiting disruptive behavior such