It was the fourth series of the Big Brother franchise on Sat.1, after it left RTL II.
From the first show, the participants and the audience could change the distribution of the housemates in each case by voting and using the Duel Arena.
Big Brother (voiced by Phil Daub) each appoint one or two residents from the "house" who must compete at the Duel Arena.
In the Duel Arena they both played a game and the loser must face the consequences for his living area.
So must for example, the losing team changing areas, receives less food or have to give personal items.