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Kathleen Freeman returns to the role of General Burkhalter's homely sister Gertrude Linkmeier, after briefly relinquishing the character to Alice Ghostley in the fourth-season episode "Watch the Trains Go By." Hoping to negotiate the release of captured Underground agent Maria Hoffman (Wendy Wilson), Hogan and his men kidnap Gertrude as a hostage. Though Burkhalter is outraged, Klink is secretly delighted; at least now he won't be railroaded into marrying the General's Wagnerian sibling. Written by Laurence Marks, "Unfair Exchange" first aired on October 24, 1969.