Big Brother 19 is the nineteenth season. of the American reality television series Big Brother. It is based upon the 1999 Dutch series of the same name. The season premiered on June 28, 2017 on CBS in the United States with a two-hour season premiere and Julie Chen returning as host. The season was titled "Summer of Temptation" with the various contestants able to receive a temptation which gave the taker a surprise reward or game advantage but also unleashed a game change for one or more other players. Viewers at home were able to vote to offer selected chosen players a secret temptation. A weekly opt-in competition, known as the Temptation Challenge, would give the winner immunity from the week's nomination but also put the last-place finisher on the block as a third nominee, able to com