Originally Posted by
Osiris-Rex
Actor replacing another for the same character. Floyd the Barber on The Andy Griffith Show was played by Walter Baldwin in one episode and was subsequently played by Howard McNear for the rest of the series.
Actor replacing a departing character in the same show. After Howard McNear had a stroke and later died, Floyd the Barber was replaced with Emmett Clark, the fix-it man, played by Paul Hartman.
(As I recall even the barber shop outer facade was converted into a repair shop)