Although it's popularly believed this episode represents the only time Perry Mason loses a case, in the first-season episode "The Case of the Terrified Typist", not only is Mason's client convicted of murder - he turns out to be really guilty! (However, Mason figures out that the murderer was impersonating someone else, and since some of the prosecution's evidence was related to the actual person whose identity had been stolen, a mistrial is declared, meaning a second trial for the defendant, presumably without Mason's services.) In the sixth-season closer, "The Case of the Witless Witness", a respected judge rules against Mason in some civil matter; when the judge ends up falsely accused of corruption, then murder, Mason doesn't hesitate to defend him.
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