Jun won Big Brother 4 in 2003, defeating Alison by a 6–1 jury vote. Alison won the final Head of Household, evicted Robert and chose Jun for the Final 2. The 82-day season introduced the Ex-Factor twist, made the Golden Power of Veto a permanent part of the weekly game and became the first season to use the fully sequestered seven-person jury system.
- Season: Big Brother 4
- Year: 2003
- Premiere: July 8, 2003
- Finale: September 24, 2003
- Length: 82 days
- Houseguests: 13
- Winner: Jun
- Runner-up: Alison
- Final vote: 6–1
- Final three: Jun, Alison and Robert
- Main twist: The Ex-Factor
- Major rule changes: Golden Power of Veto from the start of the season and a fully sequestered seven-person jury
Who Won Big Brother 4?
Jun won Big Brother 4 by a 6–1 jury vote over Alison. Robert, Erika, Jee, Jack, Justin and Dana voted for Jun. Nathan cast the only vote for Alison.
The result completed a season in which Jun and Alison repeatedly moved between groups rather than remaining loyal to one large alliance. By the end, both women had outlasted the players who had spent much of the season openly divided into opposing sides.
OBB’s Big Brother winners record preserves the complete 6–1 jury vote.
How Did the Big Brother 4 Jury Vote?
- Dana: Jun
- Nathan: Alison
- Justin: Jun
- Jack: Jun
- Jee: Jun
- Erika: Jun
- Robert: Jun
Big Brother 4 was the first season to begin the jury phase with the jurors fully sequestered from the outside world. The change followed the controversy surrounding the Big Brother 3 endgame, when previously evicted houseguests had been able to see material from the ongoing season before voting.
From BB4 onward, the Big Brother jury lived separately and was kept away from the live feeds, outside news and the normal broadcast.
Who Won the Big Brother 4 Final HOH?
- Part 1: Alison defeated Jun and Robert.
- Part 2: Jun defeated Robert.
- Part 3: Alison defeated Jun.
- Final eviction: Alison evicted Robert and took Jun to the Final 2.
Alison therefore made the final choice of the season. She could sit beside either Jun or Robert and chose Jun. The jury then gave Jun six of its seven votes.
Who Was on the Big Brother 4 Cast?
Thirteen houseguests played Big Brother 4:
- Alison
- Amanda
- Dana
- David
- Erika
- Jack
- Jee
- Jun
- Justin
- Michelle
- Nathan
- Robert
- Scott
A different houseguest had originally been expected to enter but was removed during preseason sequester after breaking the isolation rules. Jee was then added to the cast, which also added another former couple to the Ex-Factor setup.
What Was the Big Brother 4 Ex-Factor Twist?
Big Brother 4 was built around the Ex-Factor. Eight houseguests entered first. Five more then arrived, and each of those five completed a former couple already represented in the house.
The five former couples were:
- Jun and Jee
- Alison and Justin
- Erika and Robert
- David and Michelle
- Amanda and Scott
The original eight immediately recognized that the new arrivals changed the structure of the house and tried to organize against them. The twist instead produced shifting alliances in which several exes sometimes worked together, sometimes targeted one another and sometimes became useful connections between opposite sides of the game.
What Was the Big Brother 4 Eviction Order?
- Scott: expelled from the game
- 12th place: Amanda — evicted unanimously
- 11th: Michelle — evicted 6–2
- 10th: David — evicted 5–2
- 9th: Dana — evicted 6–0; first juror
- 8th: Nathan — evicted 5–0
- 7th: Justin — evicted 3–1
- 6th: Jack — evicted 2–1
- 5th: Jee — evicted 2–0
- 4th: Erika — evicted by Alison’s sole vote
- 3rd: Robert — evicted by Alison after the Final HOH
- Runner-up: Alison
- Winner: Jun
Why Was Scott Expelled From Big Brother 4?
Scott was expelled after a destructive outburst that caused other houseguests to fear for their safety. He threw chairs in the kitchen, initially refused production’s instructions to go to the Diary Room and was removed from the game shortly afterward.
Older retellings have sometimes attached other explanations to his removal, but the documented production explanation was his behavior and the safety concerns it created. OBB tracks Scott alongside the other Big Brother expulsions and voluntary exits.
How Did Big Brother 4 Change the Power of Veto?
Big Brother 4 is where the modern weekly veto structure became permanent.
The Power of Veto had been introduced during Big Brother 3, but that season began with a weaker version that did not allow a nominated houseguest to save themselves. A Golden Power of Veto appeared later in BB3.
Big Brother 4 began with the stronger version in place from the start: a nominee could win the veto and use it on themselves. From that point forward, HOH, nominations, veto, replacement nominee and eviction became the basic weekly sequence that still defines the game.
See OBB’s Power of Veto history for the rule changes across the early seasons.
Did Big Brother 4 Have the First Diamond Power of Veto?
Big Brother 4 was the first season to use the name Diamond Power of Veto, but its version did not yet have the replacement-nominee power associated with the modern Diamond Veto.
At the final four, Robert was HOH and nominated Alison and Jun. Alison won the competition called The Diamond Veto and used it to save herself.
There was only one legal replacement: Erika. Alison then held the sole vote and evicted Erika. Functionally, the result was the same as a normal final-four Golden Veto because there was no replacement decision left to make.
The stronger version — where the holder actually chooses the replacement nominee — came later. OBB separates those versions in the Diamond Power of Veto history.
Did Jun and Alison Play as Floaters?
Yes — and Big Brother 4 is one of the earliest seasons where “floater” was being used inside the game as a strategic description.
Jun and Alison did not survive by permanently attaching themselves to one side. Both maintained relationships across the house, exchanged information and adjusted to whichever group held power. Alison described herself in the Diary Room as a floater, and the show was referring to Jun and Alison as the two floaters before they became the Final 2.
That is important because the modern use of “floater” later split into two meanings. BB4 shows the original strategic version: moving between power centers rather than simply avoiding competitions or refusing to choose a side. OBB traces that distinction in Big Brother strategies.
Did the Backdoor Strategy Exist in Big Brother 4?
The actual backdoor move had not yet become a standard Big Brother strategy, but the idea and the name were already being discussed.
During Big Brother 4, Jun described a supposed “backdoor plan” in which two people would be nominated, the veto would be used and Alison would become the replacement nominee after losing her chance to protect herself. The plan Jun described was not real — she was using it to make Alison paranoid — but the basic structure of the later backdoor strategy was already there.
OBB’s Big Brother Backdoor history separates that 2003 feed usage from the later seasons where the move was actually executed.
What Were the Major Big Brother 4 Alliances?
The Ex-Factor divided the house immediately, but BB4 never stayed neatly split into the original eight against the incoming exes.
The first eight entrants tried to hold together as the Elite Eight. That structure broke quickly as personal relationships, ex-partners and new strategic deals pulled the house apart.
Justin, Jee and Robert became a durable trio often called the Three Stooges. Jun maintained a working relationship with Jee while also building routes elsewhere, and Alison repeatedly moved between groups when the balance of power shifted.
By the late game, the larger alliances had collapsed and the most flexible players had survived them. Jun and Alison reached the Final 2 despite spending much of the season in the middle of competing groups rather than at the center of one dominant alliance.
Which Big Brother 4 Houseguests Returned for All-Stars?
Alison and Erika returned for Big Brother 7 All-Stars. Alison became the first houseguest evicted from the All-Stars season. Erika reached the Final 2 and finished runner-up.
See OBB’s Big Brother 7 All-Stars season page for their second games.
Why Does Big Brother 4 Matter?
Big Brother 4 is one of the seasons that turned the early US experiment into the game that followed.
The Golden Power of Veto became part of the weekly structure from the opening round. The fully sequestered jury system began. The Diamond Veto name appeared for the first time. The language of the backdoor strategy was already being used on the feeds. And Jun and Alison showed that moving between rival power centers could carry two players all the way to the Final 2.
The Ex-Factor supplied the television hook, but those rule and strategy changes are the parts of Big Brother 4 that remained after the season ended.