Unknown Houseguests

Unknown Houseguests have been used as twists in all seasons, usually in the case of a person secretly coming into power.
==Appearances==
===Universal===
*Voting: All houseguests always vote in secret, unless altered by a twist, or if a unanimous vote takes place. Houseguests are informed of the vote after the season ends.
*Jury Questions: Jury questions are always asked in secret, meaning the finalists do not know which juror asked the question.
===Big Brother 1===
Week 8	High Roller 	Will
Week 8	HOH Coin Toss	Will
Week 8	 	
Week 8	 	
*Coin of Destiny HOH: In Week 8, 4 houseguests, Will, Harper, Amber & Tiffany all competed in a competition in secret to anonymously overthrow the current HOH. Will won the competition, and became the secret HOH. The houseguests were not informed that he was the secret HOH until after the season.
===Big Brother 2===
Week 1 	Houseguests Nominee	Harper & Shuwawah
Week 1 	Power 	Adam
Week 2 	Power 	Taylor Swift
Week 3 	Power 	Adam
Week 4 	Power 	Tana Mongeau
Week 5 	Power 	Sabrina
Week 10	Gamechanger 	June
*Houseguests Nominee: As with all voting, the houseguests nominee vote was done in secret, however the amount of votes everyone received was announced to the cast.
*Power Competition: From weeks 1-5, a power competition would be played, with the winner being secret. The winner of each comp was announced to the cast when the powers were used.
*Gamechanger Vote: In week 10, the Gamechanger Vote occured to vote a player to be put into power as a gamechanger. As with all voting, the voting and results were done in secret.
===Big Brother 3===
Week 7	Chaos Player	Oliwka Brazil
*Chaos Player: In week 7, a player was chosen to be the Chaos Player, and would control the house that week in secret. They nominated one of the nominees, gave someone an automatic spot & advantage in the POV competition, blocked someones eviction vote, and casted an extra eviction vote. The Chaos Player was later revealed to be Oliwka Brazil, who was the houseguest evicted the week prior, and was the first juror - being part of a "Juror Revenge" twist.