 In 2013 he appeared in the title role of Shostakovich's opera "Das Märchen vom Popen und seinem Knecht Balda" in a production of the Konzerthaus Berlin and from 2014 he could be heard for two seasons in Shakespeare's "The Tempest" (direction Calixto Bieito, music by Henry Purcell) at the Mannheim National Theatre.In the 2014/2015 season, Gädker performed in an opera pastichecio after Wilde's "The Canterville Ghost" with music by Rameau, Purcell and others at the Musiktheater im Revier (MiR) Gelsenkirchen.In 2015 Gädker debuted at the Festival StadtOper Soest in the title role of Mozart's "Don Giovanni," followed by the German premiere of Luke Bedford's chamber opera "Through his Teeth" with the Opera Factory Freiburg in 2016 as well as Hans Zenders "Don Quijote de la Mancha" at Frankfurt LAB with the Ensemble Modern conducted by Johannes Kalitzke.