|Big Brother 4 (US)|
|Season Run||July 8, 2003 - September 24, 2003|
|Returnees|| Alison Irwin (All-Stars)|
Erika Landin (All-Stars)
|Previous Season||Big Brother 3|
|Next Season||Big Brother 5|
Big Brother 4 (otherly known as Big Brother 4: The X-Factor) was the fourth season of the American reality television series Big Brother (U.S.). It aired on July 8, 2003, and ended on September 24, 2003, lasting 82 days. This season winner's was Jun Song, who beat her on-off ally Alison Irwin in the Final 2 by a 6-1 vote.
Major alliances of this season include the Elite Eight (Dana, Alison, Jack, Erika, David, Jun, Nathan & Scott), the Three Stooges (Justin, Jee, Robert) which extended to Jun to make the Dream Team, and the Girl Power group that Alison, Jun, and Erika formed near the end.
- The X-Factor:The big twist for the year was The X-Factor. Eight houseguests were introduced, only to have five houseguests' exes compete against them in the game. The ex-couples were:
- Golden Power of Veto: Another twist, introduced in the last veto contest of Big Brother 3, was the Golden Power of Veto, in that if a nominated person won such a veto, they would be allowed to take themselves off consideration for voting, which was not allowed when the veto was introduced originally the year before.
- Power of Veto Played Before Nominations: Yet another twist in the game occurred when in weeks 7 and 8 the veto competition happened before the nominations ceremony was held. Jee Choe won HOH in week 7 and won the POV by putting the rest of his housemates on PB&J for a week. Though Jee angered the other houseguests, his win left his future nominations secure. Jee nominated Erika Landin and Jack Owens, Jr., with Jack being evicted 2-1. Jun Song won HoH in Week 8 of the competition and was quickly escorted from the Big Brother House to attend the 20th Annual MTV Video Music Awards. Her disappearance (as she entered the Diary Room and never returned) played a part in the Veto Competition, as the houseguests had to guess where Jun was. Jun returned, and nominated Jee Choe, her ex-boyfriend, and Alison Irwin. However, Alison having already won the Veto, used it on herself, forcing Jun to put Robert Roman in her place. Despite Robert being a replacement for Alison, Jee was unanimously evicted 2-0.
- Sequestered Jury: One last twist to the format included a jury of seven who would decide the outcome of the game. When there were nine players left in the game, the evictees formed the jury. The sequestered jury was introduced after many outcry among fans when Danielle Reyes lost Big Brother 3 arguably due to evicted houseguests seeing her diary room sessions.
|Week 1||Week 2||Week 3||Week 4||Week 5||Week 6||Week 7||Week 8||Week 9||Week 10||Week 11|
|Key:||Nominated||Rep: Replacement Nominee||POV Holder||HOH|| DPOV|
After the eight new houseguests moved into the house, they were informed that some houseguests would be joined by one of their exes. At the Head of Household competition, Nathan Marlow won. Before the "exes" had entered the house, the original eight houseguests formed an alliance. Honouring the alliance's wishes, Nathan nominated two exes for eviction; Amanda Craig and Jee Choe. At the Power of Veto competion, Dana Varela won the Golden Power of Veto. Dana chose to keep the nominations the same. Scott Weintraub was expelled from the house on Day 8 after going on a tirade due to his ex-girlfriend Amanda being in the house with him. Amanda was evicted unanimously.
Jee Choe was crowned the new Head of Household at the end of the competition. Jee and his alliance, Robert Roman and Justin Giovinco, decided to target Erika Landin for eviction. He decided to nominate Michelle Maradie as a pawn, alongside Erika. David won the Power of Veto but decided not to use it. Jee, Justin and Robert were all extremely confident that Erika would be the one to be evicted. However, when the vote was announced, it was revealed that they were wrong. Michelle was evicted by a vote of 6 to 2.
Dana Varela was crowned Head of Household after winning the "Everything in 3's" competition. Dana was originally a member of the Elite Eight alliance which formed on Day 1. However, she betrayed the alliance after she nominated two of its members, Alison Irwin and Jack Owens, Jr., for eviction. Dana exclaimed that she wanted Alison out of the house, as she thought she was "coming after" her. Shortly before the Veto competition, Nathan Marlow decided with Alison that if he were to win the Veto, he would use it to save her. At the Veto competition, Nathan was victorious. At the Veto ceremony, Nathan decided to remove Alison from the block. This angered Dana greatly; so, in retaliation, she decided to nominate Nathan's ally David Lane. David was evicted by a 5 to 2 vote.
At the Head of Household competition, Alison Irwin was victorious. Alison's alliance tried to convince her to nominate Justin Giovinco for eviction. However, later that day, Alison struck a deal with Justin. At the nomination ceremony, Alison nominated Dana Varela and Jun Song. Her reasoning for this was that she wanted her enemy Dana out of the house, and that Jun would be a vote to keep Dana in the house. Robert Roman won the Veto, but decided not to use it. Dana was evicted unanimously.
At the Head of Household competition, Justin Giovinco prevailed and was crowned the next Head of Household. Justin decided to nominate two members of the opposing alliance, Nathan Marlow and Jack Owens, Jr.. His aim was to evict Nathan from the house, as he perceived him to be the bigger threat. At the Veto competition, Robert Roman won his second Power of Veto in a row. He decided to leave the nominations intact and to not use the Veto. Nathan was evicted unanimously.
After the first endurance competition of the season, Erika Landin was crowned Head of Household. Erika planned to break up the Dream Team. She did so by nominating Justin Giovinco and Robert Roman for eviction. At the Power of Veto competition, Jun Song won her first major competition of the season. She decided not to use the Veto. Justin was evicted by a vote of 3 to 1.
At the Head of Household competition, Jee Choe was victorious for a second time. For the first time ever, the Veto competiton was held before the nomination ceremony. At the Veto competition, Julie gave each of the houseguests dilemas in the diary room. The houseguest that excepted one of the dilemas would win the Power of Veto. All houseguests rejected the first two offers. However, Jee accepted his third offer which meant that he won the POV. This meant that all houseguests, except for himself, would have to eat only PB&J for one week. Jee decided to nominate Erika Landin and Jack Owens, Jr. for eviction. His plan was to break up the close relationship that they had formed with each other. However, his main objective was to evict Erika. Jack was evicted from the house.
At the Head of Household competition, Jun Song was victorious. Straight after Jun was crowned HOH, she was called to the diary room and told that she would be leaving the house to attend the MTV Music Video Awards. Once again, the Power of Veto competition occured before the nomination ceremony. The objective of the Veto competition, was to discover where Jun had gone. The houseguests were provided with clues to help them figure out where Jun was. If none of the houseguests correctly guessed where Jun was, then Jun would win the Veto. Alison Irwin guessed correctly and won the Power of Veto. After Jun returned to the house, she was told that Alison had won the POV. She decided to use this as a way to hide the fact that she and Alison had an alliance. So she nominated Alison and Jee Choe for eviction, knowing that Alison would save herself with the Veto. At the Veto ceremony, Alison removed herself from the chopping block. Jun chose Robert Roman as the replacement nominee. In the previous week, Jee angered many of the houseguests after he put the house on a PB&J. This ultimately resulted in Jee being evicted by a unanimous vote.
At the Head of Household competition, Robert Roman was victorious for the first time. At the nomination cermony, Robert revealed that he had decided to nominate both Alison Irwin and Jun Song for eviction. Though his main objective was to get Alison out of the house. Alison won the first and only Diamond Power of Veto of the season; this meant that she had sole power over who was evicted. At the live Veto ceremony, Alison decided to remove herself from the chopping block once again. This meant that Alison had to evict either Jun or Erika. Alison decided to remain loyal to her alliance with Jun and chose to evict Erika Landin.
The final Head of Household competition is played out in three challenges, to give the remaining houseguests a fair shot at securing a place in the final two. During the first endurance HOH competition, Alison Irwin won the challenge. Days later, Jun Song beat Robert Roman in the next challenge, meaning Robert was nominated. At the live HOH part 3 competition, Alison succesfully beat Jun in a personality guessing quiz, claiming the final HOH. She then chose to evict Robert.
- This season featured the first act of sex between houseguests on the show when contestants Amanda Craig and David Lane had sex under the covers in the Head of Household room. The DVD that was released featured uncensored moments from the season that weren't allowed for broadcast, including this encounter.
- This was the first season to feature an uneven number of houseguests.
- This season, along with Big Brother 1, are currently the only seasons to not feature an openly gay houseguest.
- This was the first season to feature houseguests that had formerly met each other prior to entering the House.
- This is the first season to feature two finalists with zero eviction votes cast against them.
- The three times the Power of Veto was used, they were used on Alison Irwin.
- This is the first season with an Asian-American winner (Jun).
- This is the second season in a row featuring two female finalists.
- This is the first season where males were evicted for four weeks in a row. This would happen again in Big Brother All-Stars.
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