Big Brother has unveiled a series of new twists for the week ahead.
Housemates nominated for the third time at the weekend with viewers also able to nominate a housemate in a secret vote.
Following the game changer, Kenaley Amos-Sissons and Akeem Griffiths facing the axe, and it was Kenaley who left in Friday's Big Brother results.
After her exit, Big Brother gathered the group for a shock announcement.
"Listen carefully, you've been in the house for 29 days. Some of you have been saved by the public. Some of you have saved yourselves. Some of you have never faced eviction. But you are all still here.
"From here, your decisions will have greater consequences. Your Big Coins will have more power. It's time to take the game the next level."
Big Brother then revealed that this weekend's Big Coin auction would see a secret auction for a "valuable power" - a killer nomination.
The winning bid will grant the housemate the power to put another person straight up for eviction. They will automatically face the public vote and can't be saved in the Game Changer task.
"Remember every week could be your last. Good luck, may the best housemate win," Big Brother concluded.
In a further twist, host Emma Willis announced there would be a surprise double eviction next week.
Currently a total of ten housemates are in the house with the series just passing the halfway point.
The contestants left include 26-year-old Training Consultant from Rhondda Valley, Akeem Griffiths, 21-year-old Freelance Graphic Designer from London, Brooke Berry, 18-year-old Vlogger from Norwich, Cameron Cole and 23-year-old Customer Service Agent from Clonmel, Co. Tipperary, Cian Carrigan.
Joining them are 27-year-old Bartender from Stockton-on-tees, Lewis Flanagan, 25-year-old Waitress from Barnsley, Sîan Hamshaw, 31-year-old Cleaner from London, Tomasz Wania and 31-year-old Carer from Halifax, Zoe Jones.
They were recently joined by two newbies: 25-year-old Physiotherapist from Birmingham, Hussain Ahmed and 23-year-old Race Horse Rider from Great Yarmouth, Isabella Farnese.
Big Brother 2018 continues Sunday night at 10PM.