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Klemperer’s big break came in 1961 with the courtroom drama Judgment at Nuremberg, which included a star-studded cast and significant cultural relevance; it was ultimately selected for preservation in the United States Film Registry. By 1965, he found himself auditioning for the role of Colonel Klink in Hogan's Heroes. Interestingly, he first approached the character with a serious tone, unaware that the series was a comedy. Upon adjusting his performance, Klemperer won the role, solidifying his status in television history.
Notably, Klemperer added a unique stipulation to his contract: Colonel Klink could never be portrayed as a hero nor engage in harming anyone, reflecting his distaste for the glorification of Nazis in popular media.