 The character of Warren Ferguson (played by Jack Burns (II) (qv))  was brought in to replace Barney Fife after Don Knotts (qv) left  the show. Warren was referred to on occasion as Floyd the barbers  nephew. Replacing the classic character of Barney Fife proved to be  an impossible task, however. "Warren Ferguson" did not catch on with  the viewers, and he was written out of the series after only  appearing in 11 episodes. There was no explanation in any episode  story line for Warrens departure; he simply stopped appearing.