Big Brother 15

The fifteenth season of Big Brother, dubbed as "Bad Blood" premiered on August 7, 2016.

Format
See Season 1 format

This season introduces two new twists, which are snap evictions and fake evictions. During the launch, the HouseGuests are warned that any HouseGuest may be evicted at any time, which hints that a snap eviction may occur soon. They are unaware of the possible fake evictions, as well as where the fake evictees will end up.

HouseGuests
Following the international twist from the previous season, it was confirmed that all 18 HouseGuests are exclusively from the United States.

Pledges
Following the fake evictions in Week 1, it was confirmed that 6 "Pledges" will compete for two spots in the house alongside the three fake evictees. All Pledges have a negative history with one of the 15 remaining HouseGuests, known as the "Bad Blood Pairing". Should the "Bad Blood" partner be evicted, the associated Pledge will leave the chamber and will not become a HouseGuest. Otherwise, the three fake evictees will decide which of the six pledges is deemed unworthy to become a HouseGuest.

Pledge Status
Any pledge associated with a HouseGuest that has won either Head of Household or the Power of Veto is automatically safe for the week. Each week, Frank, José and Marco are asked to rank any vulnerable pledges in order of worth. The pledge deemed the least worthy will be asked to leave the chamber and will not become a HouseGuest. The ranking is unecessary if their "Bad Blood" partner is evicted as the pledge will automatically leave. However, if the partner survives an eviction, the pledge will be safe for the week. In the event of a tie, Frank, José and Marco unanimously choose one pledge involved to leave.

Following Paula's exit in the "5 In 3 Out" week, Chanelle, Nadia and Spencer placed their bets on who between Hunter, Kate and Monica would be evicted (Chanelle chose Monica, Nadia chose Hunter and Spencer chose Kate). As Monica and Hunter were evicted, Chanelle and Nadia became worthy of entering the game and taking their spots in the house.