On Day 1, the original thirteen HouseGuests entered the house. Following their introductions, the HouseGuests all learned of the Saboteur twist, in which one HouseGuest was in the house solely to cause drama amongst the group, and could target an individual HouseGuest or the group as a whole. If the Saboteur can make it past the fifth week, they will earn a $50,000 prize and will immediately leave the game. The Saboteur would play the game much like their fellow HouseGuests, being eligible to win Head of Household as well as the Power of Veto. Following this news, the HouseGuests divided into two teams of six to compete in their first Head of Household competition; due to the uneven number of HouseGuests, Andrew chose to sit out from the competition, and it was later revealed that he had earned immunity from the first eviction for doing so. HouseGuests then competed in the "Hot Dog, We Have a Wiener" Head of Household competition. For this competition, one member from each team would ride an over-sized hot dog wiener across the backyard in an attempt to reach the other side without falling; the HouseGuests would earn money depending on when they made it across, with the first HouseGuest receiving $10,000 and the amount decreasing with each person. The HouseGuests could only keep the money if their team won the competition. The last HouseGuest to make it across for their team would win the title of Head of Household. Hayden became the first Head of Household of the season, while Monet was the winner of the $10,000 prize. Upon returning inside, the lights in the house were shut off, and when they were turned back on it was revealed that the Saboteur had locked the storage room, meaning the HouseGuests had nothing except for slop to eat for the next few days. On Day 2, Enzo, Hayden, Lane, and Matt formed "The Brigade" alliance, with the goal of being the last four HouseGuests remaining. Brendon and Rachel formed a romantic relationship early on after learning they both had a background in science. On Day 4, HouseGuests competed in the "Sweet Tooth" food competition. The team of Kathy, Matt, Rachel, and Ragan were the Have-Nots for the week. The Brigade alliance decided to target Brendon for eviction, fearing that he may be the Saboteur as well as a strong physical threat. The group also debated nominating Rachel for eviction due to her romantic relationship with Brendon. Despite this, the Saboteur later placed an "X" of tape on both Britney and Kathy's Memory Wall images after an argument between the two of them occurred, implying they should be nominated that week. On Day 5, Hayden chose to nominate Brendon and Rachel for eviction. When picking players for the Power of Veto competition, Andrew, Enzo, and Monet were selected to compete; Annie was selected to host. On Day 7, HouseGuests competed in the "Cinco de Mayonnaise" Power of Veto competition. Brendon was the winner of the Power of Veto. Following this, The Brigade alliance debated nominating Kathy in his place in an attempt to ensure Rachel's eviction, however, they later feared that Annie had formed an alliance with Brendon and Rachel. In an attempt to cause paranoia in the house, the Saboteur later made a message stating that two HouseGuests were lifelong friends who were playing the game together; this was not true. Annie later found out that she was a candidate to be nominated, and attempted to convince Hayden to nominate Britney for eviction instead. On Day 9, Brendon chose to use the Power of Veto to remove himself from the block, with Annie being nominated in his place. On Day 13, Annie became the first HouseGuest to be evicted from the house in a unanimous vote of ten to zero. Following Annie's eviction, HouseGuests competed in the "Majority Rules" Head of Household competition. The object was not to base the answer on personal opinions, but how they thought the majority would answer. The minority of the voters were eliminated each round; if there was a tie, none of the HouseGuests would be eliminated. Rachel was the winner. On Day 14, HouseGuests competed in the "BB Stick 'em Up" food competition. Brendon, Britney, Enzo, and Monet were the Have-Nots for the week. Shortly following the competition, the HouseGuests learned that Annie had been the Saboteur in a video message. Later that day, Rachel chose to nominate Britney and Monet for eviction, with Monet being her main target for eviction. When picking players for the Power of Veto competition, Brendon, Lane, and Enzo were selected to compete; Ragan was selected to host. On Day 15, HouseGuests competed in the "Big Brother Stockades" Power of Veto competition. Britney was the winner of the Power of Veto. Though Britney and Monet attempted to convince Rachel to nominate Andrew, Matt later offered to go up as a pawn to ensure Monet's eviction. On Day 17, Britney chose to use the Power of Veto to remove herself from the block, with Matt being nominated in her place. On Day 20, Monet became the second HouseGuest to be evicted from the house in a vote of seven to two. Following Monet's eviction, HouseGuests competed in the "Hang Ten" endurance Head of Household competition. Matt was the winner, while Andrew, Brendon, Enzo, and Ragan were the Have-Nots for the week. Soon after his win, Matt's Brigade alliance began pressuring him to nominate Brendon and Rachel for eviction, however, Matt was upset with Kathy for voting against him the previous week. Matt later made a deal with Brendon and Rachel to keep them safe, with the two promising Matt safety should they win Head of Household the following week. On Day 21, Matt chose to nominate Andrew and Kathy for eviction, though he claimed he would backdoor Brendon should the Power of Veto be used. When picking players for the Power of Veto competition, Brendon, Lane, and Rachel were selected to compete; Enzo was selected to host. On Day 22, HouseGuests competed in the "Veto of Fortune" Power of Veto competition. Brendon was the winner of the Power of Veto. In an attempt to convince the HouseGuests that Andrew was against Brendon and Rachel, Andrew and Brendon devised a plan to have Andrew announce that he was targeting Brendon and Rachel during the Power of Veto ceremony. On Day 23, Brendon chose not to use the Power of Veto on either nominee. On Day 27, Andrew revealed moments before voting began that Hayden and Kristen had a romantic relationship, causing much drama in the house. Minutes later, Andrew became the third HouseGuest to be evicted from the house in a unanimous vote of eight to zero. Following Andrew's eviction, HouseGuests competed in the "BB Knockout" Head of Household competition. Rachel was the winner. Following her win, Rachel and Kristen engaged in numerous arguments with one another, with Hayden and Brendon also getting involved. On Day 28, HouseGuests competed in the "Big Brother Cop Course" luxury competition. Later that day, Rachel chose to nominate Hayden and Kristen for eviction. When picking players for the Power of Veto competition, Britney, Enzo, and Ragan were selected to compete; Brendon was selected to host. On Day 29, HouseGuests competed in "The Wizards of Pinball" Power of Veto competition. Britney was the winner of the Power of Veto. Following this, Britney made a deal to take Hayden off the block if he could convince Rachel to nominate Kathy in his place. Despite Rachel initially agreeing to this, she later told Britney she would nominate Lane if the Power of Veto was used; Britney, who was close to Lane, later became torn on the situation. On Day 31, Britney chose not to use the Power of Veto on either nominee. When Hayden told Kristen he would not campaign against her, she began to realize that he had an alliance with the other men in the house. She later attempted to get Britney and Ragan on her side and turn against the male alliance, however, they weren't sure if the alliance really existed or not. On Day 34, Kristen became the fourth HouseGuest to be evicted from the house in a vote of six to one. Following Kristen's eviction, HouseGuests competed in the "True Colors" endurance Head of Household competition. Matt was the winner, while Kathy became the Have-Not for the week. On Day 35, Matt was given the opportunity to open Pandora's Box; he chose to open it. He was awarded with the Diamond Power of Veto, which he could use during a live eviction to remove one nominated HouseGuest from the block as well as name the replacement nominee. Due to Matt opening the box, however, it was revealed to the HouseGuests that a new Saboteur was in the game, with the viewers deciding who the new Saboteur should be; Ragan was selected. Unlike Annie, the new Saboteur would earn $20,000 for completing two weeks worth of sabotage and would not be removed from the game. Matt later lied to his fellow HouseGuests, claiming he had only won a dollar while inside Pandora's Box. Later that day, Matt chose to nominate Brendon and Rachel for eviction. When picking players for the Power of Veto competition, Britney, Enzo, and Kathy were selected to compete; Ragan, who won a Veto Ticket in the previous Power of Veto competition, was also able to compete. On Day 36, HouseGuests competed in the "Lovers Lane" Power of Veto competition. Britney was the winner of the Power of Veto. Rachel, in an attempt to get Britney to use the Power of Veto, offered Britney the $5,000 Rachel had won in the previous Power of Veto competition; Rachel believed that if Kathy was nominated against Brendon then Kathy would be evicted. Britney denied to do so, telling Rachel that all of the HouseGuests were against Brendon and Rachel, thus using the Power of Veto would be pointless. On Day 38, Britney chose not to use the Power of Veto on either nominee. Brendon later engaged in numerous arguments with his fellow HouseGuests in an attempt to convince them to evict him over Rachel. On Day 41, Rachel became the fifth HouseGuest to be evicted from the house in a unanimous vote of six to zero. She became the first member of the Jury of Seven. Following Rachel's eviction, HouseGuests competed in the "Oh What a Tangled Web" Head of Household competition. Brendon was the winner, and chose Britney, Matt, and Ragan to be the Have-Nots for the week. In an attempt to protect himself for the following week, Brendon made a deal with Britney that she would keep him safe should she win Head of Household in exchange for safety this week; she agreed to this deal. On Day 42, Brendon chose to nominate Ragan and Lane for eviction, with Ragan being his main target. When picking players for the Power of Veto competition, Enzo, Hayden, and Kathy were selected to compete. On Day 43, HouseGuests competed in the "Zingbot 3000" Power of Veto competition. Ragan was the winner of the Power of Veto. Later that day, Brendon was given the opportunity to open Pandora's Box; he chose to open it. He learned that he would leave the house for twenty-four hours for a spa vacation, where he believed Rachel would be as well; while he was gone, Rachel entered the house for twenty-four hours. During her time in the house, Rachel engaged in numerous arguments with Ragan, and later attempted to communicate with Brendon by spelling "Matt" out with pretzels, implying he should be nominated. On Day 44, Rachel left the house and Brendon returned. On Day 45, Ragan chose to use the Power of Veto to remove himself from the block, with Matt being nominated in his place. On Day 48, Matt chose to use the Diamond Power of Veto to remove himself from the block, nominating Kathy in his place. Minutes later, Kathy became the sixth HouseGuest to be evicted from the house in a unanimous vote of five to zero. She became the second member of the Jury of Seven. Following Kathy's eviction, HouseGuests competed in the "Big Brother Says" Head of Household competition. Britney was the winner. On Day 49, HouseGuests competed in "The Good, the Bad, and the Ugly" food competition. Despite having previously promised him safety the previous week, Britney later debated nominating Brendon for eviction. Matt later urged her to nominate Enzo as a pawn against Brendon, though the other members of The Brigade hoped to see Matt nominated as a pawn. Later that day, Britney chose to nominate Brendon and Enzo for eviction. When picking players for the Power of Veto competition, Hayden, Lane, and Matt were selected to compete; Ragan was the host. On Day 50, HouseGuests competed in the "Big Brother Zoo" Power of Veto competition. Brendon was the winner. Later that day, Britney was given the opportunity to open Pandora's Box; she chose to open it. While she was locked inside with former HouseGuest
Jessie Godderz, the other HouseGuests earned a party in the backyard. On Day 52, Brendon chose to use the Power of Veto to remove himself from the block, with Matt being nominated in his place. On Day 55, Matt became the seventh HouseGuest to be evicted from the house in a unanimous vote of four to zero. HouseGuests then took part in a surprise Double Eviction week, meaning another HouseGuest would be evicted that night. HouseGuests competed in the "Delivering the Goods" Head of Household competition. Hayden was the winner. Hayden then chose to nominate Brendon and Ragan for eviction. HouseGuests then competed in the "Before or After" Power of Veto competition. Ragan was the winner. Ragan chose to use the Power of Veto to remove himself from the block, with Britney being nominated in his place. Brendon then became the eighth HouseGuest to be evicted from the house in a unanimous vote of three to zero. He became the fourth member of the Jury of Seven. Following Matt and Brendon's eviction, HouseGuests competed in the "Big Brother Blackjack" Head of Household competition. Lane was the winner. Ragan, who had come to realize that Enzo, Hayden, and Lane were in an alliance, feared for his safety. Lane was later given the opportunity to open Pandora's Box; he chose to open it. He was able to select three cash prizes, however, for each prize he took a punishment would be placed on the HouseGuests. The punishments bestowed upon the house saw the removal of all of the silverware and cups in the house, speak only with sock puppets for twelve hours, and having to dance whenever music was played in the house. On Day 56, Lane chose to nominate Enzo and Ragan for eviction, with the goal of evicting Ragan. On Day 57, HouseGuests competed in the "Otev the Broadway Clam" Power of Veto competition. Enzo was the winner. On Day 59, Enzo chose to use the Power of Veto to remove himself from the block, with Hayden being nominated in his place. Lane's decision to not nominate Britney led to Enzo and Hayden being upset with him, though the Brigade still remained intact. Lane also spoke about secretly considering taking Britney to the Final 2 with him if he could, due to his growing bond with her, and also fearing his close friend Hayden would be much more difficult to get the jury votes to defeat. On Day 62, Ragan became the ninth HouseGuest to be evicted from the house in a unanimous vote of two to zero. He became the fifth member of the Jury of Seven. Following Ragan's eviction, HouseGuests competed in the "Big Brother Christmas" Head of Household competition. Hayden was the winner. On Day 63, HouseGuests competed in the "Hide and Seek" luxury competition. Britney was the winner. Later that day, Hayden chose to nominate Britney and Lane for eviction, largely due to their growing bond and since they would probably not eliminate the other. On Day 64, HouseGuests competed in the "Big Brother Marque" final Power of Veto competition. Hayden was the winner of the final Power of Veto. Following this win, it ensured that Britney would be evicted and that The Brigade would be the final remaining HouseGuests. This led to the Brigade alliance telling Britney that they were aligned and that she would be evicted that week, leading to her breaking down crying. On Day 67, Hayden chose not to use the Power of Veto on either nominee. Minutes later, Enzo cast the sole vote to evict Britney from the house. She became the sixth member of the Jury of Seven. Following Britney's eviction, HouseGuests began competing in the "Rumble In the Big Brother Jungle" Head of Household competition. Enzo and Lane later competed in the "It's Alive" competition. Lane was the winner. On Day 75, Hayden and Lane competed live in the "Jury Statements" final Head of Household competition. Minutes later, Hayden cast the sole vote to evict Enzo, making Hayden and Lane the Final Two. Hayden was then crowned the winner of
Big Brother 12 in a vote of four to three. ==Episodes==