The Show Must Go On (Grimm)

Opening quote: "Under such conditions, whatever is evil in men's natures comes to the front."

At a carnival, a ringmaster named Hedig (Carlo Rota) is presenting to the public four Wesen that act as freaks, taking the excuse of magic. One of the Wesen, Max (Sam Witwer), who is also a Blutbad, leaves the carnival when two girls show up as they want to meet him. They invite him for drinks and although he is hesitant, he goes with them. The girls take him to their house and after discussion, he woges into a Blutbad and attacks them.

While attending a dinner with Monroe (Silas Weir Mitchell) and Rosalee (Bree Turner) with Juliette (Bitsie Tulloch), Nick (David Giuntoli) is asked by Monroe to be his best man in their wedding while Juliette is asked to be Rosalee's maid of honor and they both agree. However, later that night, Nick tells Juliette that he is concerned about attending the wedding as many Wesen will be attending and they will recognize him as a Grimm.

Wu (Reggie Lee) is finally in service after leaving the psychiatric hospital and Nick and Hank (Russell Hornsby) investigate the murder of the two girls, finding their tickets to the carnival. They go to the carnival and Nick and Hank discover the Wesen performers, wondering if the Wesen Council could intervene. Back in Europe, Adalind (Claire Coffee) and Meisner (Damien Puckler) continue fleeing from the Verrat and find Sebastien (Christian Lagadec) in a car, badly hurt. A Verrat agent arrives but Adalind uses her abilities to make him kill himself. Sebastian is given a gun and Adalind and Meisner flee from the scene in a car. Viktor (Alexis Denisof) and the Verrat arrive and Sebastien manages to kill most of them but Viktor. He refuses to say where they went and Viktor shoots him, killing him.

While Nick and Hank talk with Hedig, Max loses control of himself and attacks one of the performers, Genvieve (Chryssie Whitehead). Nick and Hank talk with Monroe and Rosalee. They explain that the Council does not intervene because the public believes the performers are using magic and illusion although some are against it for exploitation. However, this could also cause the "Umkippen", an act in which a Wesen has forced himself to woge so many times that they can lose control. Monroe and Rosalee decide to go to the carnival for an intervention, which they believe could help the Wesen. However, Rosalee is selected as the replacement for Genvieve for her Wesen part.

Meisner tells Adalind that he has a Resistance agent to take her back to Portland but he will remain in Vienna. While preparing herself, Rosalee discovers that Max is the most affected with the Umkippen, deducing he is the killer. Before the show, Max confronts Hedig, who woges into a Löwen and reveals himself to be the killer of the people who saw him woged. Having discovered new evidence, Nick and Hank interrupt the show to arrest Hedig. Max breaks out of his cage and begins an attack while Hedig escapes to a mirror maze to find the Wesen. The performers are tired of his treatment and a Dämonfeuer kills him. The episode ends as Monroe and Rosalee are preparing for bed when Rosalee appears wearing her costume, causing Monroe to howl.