A Big Brother zombie is a term used in the reality TV show "Big Brother 25" to refer to evicted houseguests who have a chance to re-enter the game. The twist involves the evicted houseguests competing in challenges to become a "zombie" for the week, and the winner of the challenge gets to return to the game. The term "zombie" is used metaphorically, and the challenges do not involve actual zombies. The challenges are different each week, and they involve tasks such as maneuvering a ball around a large zombie. The idea of a zombie apocalypse occurring during the filming of Big Brother was the basic idea for the British television series "Dead Set".