Big Brother: Unlocked

Big Brother 17 was the seventeenth season of the American reality television series Big Brother. The season premiered on June 24, 2015, on CBS, and once again was a two-night launch with the following episode airing on June 25, 2015. The season ended on September 23, 2015, with a 90-minute season finale following the fall season premiere of Survivor: Cambodia. The season featured the highest number of HouseGuests to date with 17 HouseGuests in total. On September 23, Steve Moses won the game in a 6-3 vote against Liz Nolan.

Big Brother 18 is the eighteenth season of the American reality television series Big Brother. The season premiered on June 22, 2016 on CBS with a two-hour season premiere and ended with a 90-minute season finale on September 21, 2016. Julie Chen returned as host. On September 21, 2016, Nicole Franzel won the game in a 5-4 vote against Paul Abrahamian. The season lasted for 99 days making it the longest running season in the show's 16-year history.

Big Brother 8 was the eighth season of the American reality television series Big Brother. It is based upon the Netherlands series of the same name, which gained notoriety in 1999 and 2000. The series premiered on CBS on July 5, 2007 and lasted eleven weeks until the live finale on September 18, 2007. The eighth season saw little to no change in ratings. The season premiered to 7.40 million viewers, the lowest premiere numbers for any season at the time. The season finale had 8.51 million viewers, making it the second lowest rated finale at the time. In total, the series averaged 7.52 million viewers, only 0.4 behind the previous edition. Big Brother 8 featured 14 HouseGuests, the same amount that was featured in the previous season. The series ended after 81 days, in which HouseGuest Dick Donato was crowned the winner, and his daughter Daniele Donato the runner-up.

Big Brother 15 is the fifteenth season of the American reality television series Big Brother. The season premiered on CBS on June 26, 2013, and concluded on September 18, 2013. It was the longest season to date, running 90 days. This season featured 16 HouseGuests. The premise of the series remained largely unchanged from previous editions of the series, in which a group of contestants, known as "HouseGuests", competing in challenges for power and safety before voting by voting each other out of the house to be the last HouseGuest remaining. The September 5, 2013, broadcast marked the show's 500th episode. On September 18, 2013, Andy Herren won the season by a 7–2 vote over runner-up GinaMarie Zimmerman.

Big Brother is an American television reality competition show based on the original Dutch reality show of the same name created by producer John de Mol in 1997. The series takes its name from the character in George Orwell's 1949 novel Nineteen Eighty-Four. The American series launched on July 5, 2000 on CBS and is currently the second longest-running adaptation in the Big Brother franchise to date, after the Spanish version. The show broadly follows the premise of other versions of the format, in which a group of contestants, known as "HouseGuests", live together in a specially constructed house that is isolated from the outside world for a cash prize of $500,000 (or $750,000 in the 23rd season). The HouseGuests are continuously monitored during their stay in the house by live television cameras as well as personal audio microphones. Throughout the course of the competition, HouseGuests are evicted from the house, by being voted out of the competition. In its inaugural season (which followed the original Dutch format), ratings declined and critical reaction grew increasingly negative, prompting the series to be revamped for the second season, which focused on competition and gameplay.On July 23, 2020, after production delays due to the ongoing COVID-19 pandemic, it was announced that the 22nd season would be an "All-Stars" edition (consisting of only previous houseguests), premiering on August 5, 2020. The "All-Stars" format was originally used in season 7. A twenty-fourth season of the series is set to premiere on July 6, 2022.The show also produced two spin-offs: Big Brother: Over the Top, which aired for one season and was the first reality game show to air exclusively on a streaming platform airing in Fall 2016 on CBS' streaming service, CBS All Access; and Celebrity Big Brother, which aired on CBS in February 2018.

Big Brother 14 was the fourteenth season of the American reality television series Big Brother that premiered on July 12, 2012 on CBS and ended with its finale on September 19, 2012. The show is produced by Endemol USA and Fly on the Wall Entertainment. The premise of the series remained largely unchanged from previous editions of the series, in which a group of contestants, known as "HouseGuests," compete to win the series by voting each other off and being the last HouseGuest remaining. One HouseGuest, known as the Head of Household, must nominate two of their fellow HouseGuests for eviction. The winner of the Power of Veto can remove one of the nominees from the block, forcing the HoH to nominate another HouseGuest. The HouseGuests then vote to evict one of the nominees and the HouseGuest with the most votes is evicted. When only two HouseGuests remained, the last seven evicted HouseGuests, known as the Jury of Seven, would decide which of them would win the $500,000 prize. A HouseGuest can be expelled from the show for breaking rules, such as exhibiting violent and disruptive behavior. On September 19, 2012, Ian Terry won the season by a 6–1 vote over Dan Gheesling, who was crowned as the runner-up and became the first HouseGuest in Big Brother history to reach the Final Two twice.

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 compete in the weekly Veto Competition and avoid a backdoor nomination. On September 20, 2017, Josh Martinez won the game in a 5–4 vote against returning Big Brother 18 runner-up Paul Abrahamian, earning the latter the distinction of being the first person to receive the runner-up prize two years consecutively.

Celebrity Big Brother, also known as Big Brother: Celebrity Edition, is a reality television spin-off series of the American adaptation of Big Brother created by John de Mol. The series began on February 7, 2018 on CBS in the United States and was simulcast in Canada on Global. The series is filmed at CBS Studio Center in sound stage eighteen located in Studio City, Los Angeles. Julie Chen Moonves reprises her role as host from Big Brother with Allison Grodner and Rich Meehan also returning as executive producers. The series is produced by Fly on the Wall Entertainment in association with Endemol Shine North America. The premise of the series remained largely unchanged from the main edition of Big Brother, in which a group of contestants, known as "HouseGuests," who live in a purpose-built house, known as the Big Brother House, with no contact from the outside world. The contestants compete in competitions for safety and for power over the household before voting each other out in an attempt to be the last HouseGuest remaining and win a grand prize. The difference from the parent series is the inclusion of "Celebrity" HouseGuests (those with notoriety prior to participating in the series), the time frame (a month as opposed to 3 months) and a smaller grand prize ($250,000 as opposed to $500,000) Each season is also transmitted in real-time which allows for greater viewer participation in the form of America's Vote where the public can give their favorite HouseGuest various prizes ranging from luxury items to advantage to help them survive inside the House. Prior to the live season finale, the viewers are able to vote for their America's Favorite HouseGuest with the winner getting an auxiliary prize of $25,000. The first overall season of Celebrity Big Brother worldwide premiered in the United Kingdom in 2001 while an American version of the format has been speculated since 2002. The first season of the American adaptation was announced during a live double eviction episode of the nineteenth regular season on September 7, 2017 by Julie Chen. The first season was scheduled during the February 2018 sweeps period to counterprogram NBC's coverage of the 2018 Winter Olympics. The series premiere was the number one program for CBS attracting 7.27 million viewers and the highest-rated season premiere since Big Brother 13. The program was often covered in the media due to the inclusion of Omarosa Manigault and her political revelations in the first season. In September 2021, CBS renewed Celebrity Big Brother for a third season, which premiered on February 2, 2022.

Big Brother 13 was the thirteenth season of the American reality television series Big Brother. It is based upon the Netherlands series of the same name, which gained notoriety in 1999 and 2000. The series premiered on CBS on July 7, 2011 and lasted ten weeks until the live finale on September 14, 2011. The 13th season continued to have an increase in ratings, much like the previous two seasons had. The season premiered to a total of 7.89 million viewers, a slight increase from the previous season's launch. The season finale had a total of 7.78 million viewers, only slightly lower than the previous season. In total, the series averaged 7.95 million viewers, higher than that of the previous three seasons and the highest since Big Brother 5 in 2004. Big Brother 13 featured a total of 14 HouseGuests, six of which were previous HouseGuests from past seasons. The series ended after 75 days, in which returning HouseGuest Rachel Reilly was crowned the Winner, while new HouseGuest Porsche Briggs was crowned the Runner-up.

Big Brother 11 was the eleventh season of the American reality television series Big Brother. It is based upon the Netherlands series of the same name, which gained notoriety in 1999 and 2000. The series premiered on CBS on July 9, 2009 and lasted ten weeks until the live finale on September 15, 2009. The eleventh season saw a slight increase in ratings when compared to the past season of the series, which had some of the lowest ratings to date. The season premiered to a total of 6.59 million viewers, a slight increase from the previous season's launch. Despite this, it is the second lowest premiere for a season behind Big Brother 10. The season finale had a total of 7.78 million viewers, continuing to average slightly above the past season. In total, the series averaged 7.19 million viewers, higher than that of the previous two seasons. Big Brother 11 featured a total of 13 HouseGuests, one of which was a returning player from a previous season. The series ended after 73 days, in which HouseGuest Jordan Lloyd was crowned the winner and Natalie Martinez the runner-up.

Celebrity Big Brother, also known as Big Brother: Celebrity Edition, is a spin-off series of the American version of the Dutch reality television franchise Big Brother. This season aired during the winter of the 2017–18 network television season on CBS and was the second U.S. Big Brother season to air outside the usual summer television season, the first being Big Brother 9 in 2008. Julie Chen returned as host, with Allison Grodner and Rich Meehan returning as executive producers. The series is produced by Fly on the Wall Entertainment in association with Endemol Shine North America. The first season premiered on February 7, 2018.The promotional logo was released on December 20, 2017. The logo is similar to that used for Big Brother 19, with the word "celebrity" added. The first teaser was also released the same day. In January 2018 official photos of the house and backyard were released through a press release and an Instagram livestream with Julie Chen. On January 28, 2018, the official cast was announced during the 60th Annual Grammy Awards. The first season officially concluded on February 25, 2018 when Marissa Jaret Winokur beat Ross Mathews by a final jury vote of 6 to 3. Ross was also later named America's Favorite HouseGuest. On May 12, 2018, CBS renewed the spin-off for a second season.

Celebrity Big Brother 2 is the second season of the American reality television series Celebrity Big Brother, also known as Big Brother: Celebrity Edition, premiered on CBS on January 21, 2019 and concluded on February 13, 2019. It consisted of thirteen episodes, each approximately 60–120 minutes long, with Allison Grodner and Rich Meehan as executive producers for Fly on the Wall Entertainment, in association with Endemol Shine North America. CBS ordered the season on May 12, 2018 and confirmed it for a mid-season return when the network revealed its 2018–19 fall schedule on May 16, 2018. The network confirmed on November 27, 2018 that Julie Chen Moonves would continue her role as host despite media speculation that she may not return after her husband Les Moonves' departure from CBS Corporation due to sexual misconduct allegations against him. The season followed a group of celebrities, known as HouseGuests, who lived in the Big Brother House under constant surveillance with no contact from the outside world. Periodically the HouseGuests faced eviction while trying to be the last HouseGuest standing and win the grand prize. Tamar Braxton beat Ricky Williams by a unanimous jury vote during the live final. Braxton is the first African-American winner of the United States version of Big Brother, and she and Williams made up the first final two who were both African-American. Tom Green was later named America's Favorite HouseGuest.