Each show has several celebrities invited who have to bet on different contestant(s) achieving his/her/their goal of performing a stunt. If the celebrities fail to anticipate whether their stunt will succeed or not, they have to meet their stake. Usually one stunt takes place outside the studio. At the end of the show, the best stunt is being voted for by the audience. There is also an audience bet, a stunt which the audience does choose from a preselection, which is not prepared and must be organized by the host city within the time the show is running. If the stunt succeeds, the show's host has to meet his stake.
Cast of Season 17