A new group of houseguests moves into the Big Brother house and begins the game. In a series first, one contestant will play the game with one goal: to secretly wreak havoc on fellow houseguests.
Andrew shakes up the house by outing Kristen and Hayden's relationship during his final plea before the live eviction. Also, the power shifts in the house when a new HoH is crowned.
The saboteur strikes again and tries to cause a rift between two houseguests as the first nominations are announced.
Hayden and Kristen struggle to comes to terms with the fact that one of them will be evicted. Also, the competition begins for what could be the most powerful HoH of the summer.
The first power of veto competition takes place. Meanwhile, Brendon and Rachel take their relationship to the next level when they share a kiss.