Big Brother 4

, also known as Big Brother 4: Undercover, is the fourth season of Munchie's Big Brother, which premiered July 5 2021, and is still filming. The season featured 16 houseguests and has not ended yet.

Production
Each week, the houseguests compete for the title of Head of Household. The HOH must take on the responsibility of nominating two houseguests for eviction. The winner of the Power of Veto then has the ability to save one of the two nominees, forcing the HOH to name a replacement nominee, or they may choose not to use it. The final two nominees on the block at the end of each week must then face the votes of all their fellow housemates, excluding the HOH. The person with the most votes is evicted, with the HoH making the final decision in the event of a tie. Once only the final two houseguests remain, a jury of previously evicted houseguests cast their votes to decide the winner of Big Brother.

Progression Chart
{| class="wikitable" style="font-size:75%; text-align:center" ! rowspan="2"| ! rowspan="2"|Week 1 ! rowspan="2"|Week 2 ! rowspan="2"|Week 3 ! rowspan="2"|Week 4 ! rowspan="2"|Week 5 ! rowspan="2"|Week 6 ! rowspan="2"|Week 7 ! rowspan="2"|Week 8 ! rowspan="2"|Week 9 ! rowspan="2"|Week 10 ! rowspan="2"|Week 11 ! rowspan="2"|Week 12 ! colspan="2"|Week 13 ! Evicton ! Finale