Big Sistah Season 1

Production
On Tuesday, July 9th, 2015, the sign-up video and application form for Big Sistah Season 1 was first made public. It was announced that 12 houseguests would be competing in the season and that the cast would be revealed on Monday, July 20th, 2015. On July 20th, the cast was revealed and the season began.

{| class="wikitable sortable" The Red Phone: On Day 1, the houseguests were informed that a Red Phone would be placed in the storage room of the Big Sistah house. Each week, the Red Phone will ring and the first houseguest to answer the Red Phone will receive a secret task from Big Sistah. If they successfully complete their task, they will receive a reward.

Twists/Changes

 * The Red Phone: On Day 1, the houseguests were informed that a Red Phone would be placed in the storage room of the Big Sistah house. Each week, the Red Phone will ring and the first houseguest to answer the Red Phone will receive a secret task from Big Sistah. If they successfully complete their task, they will receive a reward.

Season History
On Day 1, 12 houseguests entered the Big Sistah house. They were informed of this season's twist, the Red Phone. On Day 1, the houseguests also competed in their first HoH competition of the season called "First Impressions". They each had to vote for someone other than themselves to become the first HoH of the season. On Day 1, Jackie received the most votes and won the first HoH competition of the season. On Day 2, Jackie nominated Hayden and Shane for eviction. On Day 3, Jackie, Hayden, Shane, Andy, Jason and Helen participated in the PoV competition called "Avalanche", which Hayden ultimately won. On Day 5, Hayden decided to use the Power of Veto to save himself from eviction. Jackie then decided to renominate Zach in his place. On Day 6, Andy was expelled from the Big Brother house for inactivity. On Day 7, there was a 4-4 tie in the vote. Jackie broke the tie by evicting Zach from the Big Sistah house.

On Day 7, Helen won HoH in an endurance competition called "Frozen". On Day 8, Helen nominated Jason and Shane for eviction. On Day 9, Helen nominated Jason and Shane for eviction. On Day 10, Helen, Jason, Shane, Jackie, Kevin and Sindy participate in the PoV competition called "Puzzled", which Shane won. On Day 12, Shane decided to use the Power of Veto on himself. Helen then hose to renominate Kevin in Shane's place. On Day 14, it was announced that one houseguest received a double vote for succeeding in their secret task after answering the Red Phone. It was up to them to decide whether they wanted to reveal their identity. At the eviction, Kevin was evicted in a vote of 8-0 and became the first member of the jury.

On Day 14, Daniele won HoH in a competition called "Who's That Chick?" On Day 15, Daniele nominated Brittnee and Helen for eviction. On Day 16, Daniele, Brittnee, Helen, Hayden, Jackie and Jason participated in the PoV competition called "Piggy Bank", which Jackie ultimately won. On Day 18, Jackie decided not to use the Power of Veto, keeping Brittnee and Helen on the chopping block. On Day 21, it was announced that one houseguest received the ability to block one houseguest from voting at the eviction for succeeding in their secret task after answering the Red Phone. It was up to them whether they wanted to reveal their identity. That person chose to block Sindy's vote at the eviction. On Day 21, Helen was evicted from the Big Sistah house in a 4-1 vote, making her the second member of the jury. After the eviction, it was announced that one of the first 3 evictees would be returning to the game.

On Day 21, it was announced that Helen won the return competition to re-enter the game. On Day 21, Joey won HoH in a competition called "Election Day" in which the public voted for someone to become HoH. On Day 22, Joey nominated Shane and Sindy for eviction. On Day 23 Joey, Shane, Sindy, Hayden, Helen and Jason participated in the PoV competition called "Big Sistah Dictionary", which Jason ultimately won. On Day 25, Jason chose not to use the Power of Veto, leaving Shane and Sindy as the final nominees. On Day 28, there was a 3-3 tie in the vote. Joey broke the tie by deciding to evict Shane from the game.

On Day 28, Sindy won HoH in a competition called "Comp of All Comps" in which she needed to respond with the competition type after being told its name. On Day 29, Sindy nominated Daniele and Jason for eviction. On Day 30, Sindy, Daniele, Jason, Brittnee, Helen and Jackie participated in the PoV competition called "Bubble Spinner", which Brittnee ultimately won. On Day 32, Brittnee chose to use the Power of Veto on Jason. Forced to name a replacement, Sindy nominated Jackie for eviction in Jason's place. On Day 35, Daniele was ultimately evicted from the Big Sistah house by a vote of 3-2, making her the third member of the jury.

On Day 35, Jackie won HoH in a competition called "Posters for Power", in which she needed to design a poster for this season. On Day 36, Jackie nominated Hayden and Jason for eviction. Later that day it was announced that someone announced the Red Phone and successfully completed their secret task, allowing them to choose who would sit out of the Veto competition. That person chose to have Sindy sit out of the Veto competition and it was left up to them to decide whether they wanted to reveal their identity. On Day 37, everyone aside from Sindy competed in the PoV competition called "ZING!", which Jackie ultimately won. On Day 39, Jackie decided to use the Power of Veto to save Jason from the chopping block. She then nominated Sindy in Jason's place. On Day 42, Sindy was backdoored and evicted from the Big Sistah house by a vote of 3-1, and she became the fourth member of the jury.

On Day 42, Helen won HoH in a competition called "Knockout", in which the houseguests needed to knock out other player's lives by being the first to correctly guess whether a statement regarding Big Brother U.S. trivia was true or false. On Day 43, Helen nominated Hayden and Jason for eviction. On Day 44, everyone participated in the PoV competition called "Simon", which Brittnee ultimately won. On Day 46, Brittnee chose not to use the Power of Veto, leaving Hayden and Jason on the chopping block. On Day 49, before the live vote and eviction occurred, Jason was expelled from the game due to inactivity. Since Jason was one of Helen's nominees, the eviction was cancelled and the following week began. Due to his expulsion, Jason did not become a member of the jury and it was announced that there would be 7 jury members as opposed to 8.

On Day 49, Brittnee won HoH in a competition called "Everyone's a Critic", in which the houseguests needed to write about their favourite Big Brother U.S. season. On Day 50, Brittnee nominated Hayden and Joey for eviction. On Day 51, everyone participated in the PoV competition called "Paying Tribute", which Jackie ultimately won by making the best tribute for a formerly evicted houseguest. On Day 53, Jackie decided to not use the Power of Veto, keeping Hayden and Joey as the nominees. On Day 56, Hayden was ultimately evicted by a vote of 2-0, making him the fifth member of the jury.

On Day 56, Jackie won HoH in a competition called "The Name Game" in which she had to remember the names of previous competitions. On Day 57, Jackie nominated Helen and Joey for eviction. On Day 58, everyone participated in the Power of Veto competition called "Split or Steal", which Brittnee ultimately won. Brittnee was unable to use the Power of Veto, as there were no possible replacement nominees, leaving Helen and Joey as the final nominees. On Day 63, Brittnee chose to evict Joey from the Big Sistah house, making her the sixth member of the jury.

On Day 63, Brittnee, Helen and Jackie all began competing in the final HoH competition, which was divided into 3 parts. Part 1 was an endurance competition called "The Awake-a-thon", which was won by Helen. Brittnee and Jackie faced off in Part 2, which was called "Web of Truths" and required the houseguests to put houseguests names into a web in order to make every statement true. Jackie won Part 2, allowing her to advance to Part 3 with Helen. Part 3 was called "Before or After" and the houseguests needed to state whether an event that took place this season took place before or after another event. Jackie won Part 3, allowing her to choose who to evict and who to bring with her to the final 2. On Day 70, Jackie chose to evict Brittnee from the Big Sistah house, making her the seventh and final member of the jury.