Bill as "Glenn"
in "Struck By Lightning"
(1979)

 

From the official press kit for the show:

 

"Bill Erwin stars as Glenn, the long-time boarder at a lively old inn whose caretaker is the notorious monster created by Dr. Frankenstein, in the new comedy series, "Struck by Lightning," to be presented SATURDAYS (8:30-9:00 PM, ET) starting this fall on the CBS Television Network."