Question: Waylon Smithers, often referred to as Mr. Smithers, debuted in the January 21, 1990 episode of The Simpsons as the personal assistant to which Springfield Nuclear Power Plant owner?
Sentence (from "Waylon Smithers"): Smithers first appeared in the episode "Homer's Odyssey", although his voice could be heard in the series premiere "Simpsons Roasting on an Open Fire".
Relevant evidence: Yes