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?

Context paragraphs:
Lungmen Nuclear Power Plant: The Lungmen Nuclear Power Plant () (formerly Gongliao Nuclear Power Plant and Fourth Nuclear Power Plant, often abbreviated as: ), located nearby Fulong Beach, Gongliao District, New Taipei City, is Taiwan's fourth nuclear power plant, consisting of two ABWRs each of 1,300 MWe net.  It is owned by Taiwan Power Company (Taipower).  It was intended to be the first of these advanced Generation III reactors built outside Japan.  In 2014 construction of the plant was deferred.

Jinshan Nuclear Power Plant: The Jinshan Nuclear Power Plant or Chin Shan Nuclear Power Plant (金山核能發電廠), First Nuclear Power Plant (第一核能發電廠 or 核一), is a nuclear power plant in Shimen, New Taipei, Taiwan.  Commissioned in 1978 for its first nuclear reactor, the plant is Taiwan's first nuclear power plant as well as Taiwan's smallest nuclear power plant.

Waylon Smithers: Waylon J. Smithers Jr., usually referred to as Mr. Smithers or simply Smithers, is a recurring fictional character in the American animated sitcom "The Simpsons", who is voiced by Harry Shearer.  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".  He is the consummate executive and personal assistant of Springfield Nuclear Power Plant's owner Mr. Burns.

Nuclear power debate: The nuclear power debate is a long-running controversy about the risks and benefits of using nuclear reactors to generate electricity for civilian purposes.  The debate about nuclear power peaked during the 1970s and 1980s, as more and more reactors were built and came online, and "reached an intensity unprecedented in the history of technology controversies" in some countries.  Thereafter, the nuclear industry created jobs, focused on safety and public concerns mostly waned.  In the last decade, however, with growing public awareness about climate change and the critical role that carbon dioxide and methane emissions play in causing the heating of the earth's atmosphere, there's been a resurgence in the intensity nuclear power debate once again.  Nuclear power advocates and those who are most concerned about climate change point to nuclear power's reliable, emission-free, high-density energy and a generation of young physicists and engineers working to bring a new generation of nuclear technology into existence to replace fossil fuels.  On the other hand, skeptics can point to two frightening nuclear accidents, the Chernobyl disaster in 1986 and subsequently the Fukushima Daiichi nuclear disaster, combined with escalating acts of global terrorism, to argue against continuing use of the technology.  The debate continues today between those who fear the power of nuclear and those who fear what will happen to the earth if we don't use nuclear power.  At the 1963 ground-breaking for what would become the world's largest nuclear power plant, President John F. Kennedy declared that nuclear power was a "step on the long road to peace," and that by using "science and technology to achieve significant breakthroughs" that we could "conserve the resources" to leave the world in better shape.  Yet he also acknowledged that the Atomic Age was a "dreadful age" and "when we broke the atom apart, we changed the history of the world."

The Devil Wears Nada: "The Devil Wears Nada" is the fifth episode of the twenty-first season of "The Simpsons".  It first aired on the Fox network in the United States on November 15, 2009.  In the episode, Marge and a group called the "Charity Chicks" pose for a history-oriented calendar in hopes of raising money for charity, but Marge becomes the talk of the town due to the erotic poses she made after a few drinks of red wine.  Meanwhile, Carl is chosen as the newest supervisor at the Springfield Nuclear Power Plant, and hires Homer to be his personal assistant.

Homer's Odyssey (The Simpsons): "Homer's Odyssey" is the third episode of the first season of "The Simpsons".  It originally aired on the Fox network in the United States on January 21, 1990.  In this episode, Homer becomes a crusader for citizen safety in Springfield, and is promoted to his current position as Nuclear Safety Inspector for the entire power plant.  It was written by Jay Kogen and Wallace Wolodarsky and was the first "Simpsons" script to be completed, although it was the third episode produced.

Mr. Burns: Charles Montgomery Burns, known as C. Montgomery Burns and Monty Burns, but usually referred to simply as Mr. Burns, occasionally as Mr Snrub, is a recurring character in the animated television series "The Simpsons", and is voiced by Harry Shearer.  Mr. Burns is the evil owner of the Springfield Nuclear Power Plant and is also Homer Simpson's boss.  He is assisted at almost all times by Waylon Smithers, his loyal and sycophantic aide, adviser, confidant and secret admirer.

Who Shot Mr. Burns?: "Who Shot Mr. Burns?"  is a two-part episode of the American animated television series "The Simpsons".  Part One is the twenty-fifth and final episode of the sixth season and originally aired on the Fox network in the United States on May 21, 1995, while Part Two is the season premiere of the seventh season and aired on September 17, 1995.  Springfield Elementary School strikes oil, but Mr. Burns steals it and at the same time brings misery to many of Springfield's citizens.  Part One has a cliffhanger ending where Mr. Burns is shot by an unidentified assailant.  In Part Two, Springfield's police try to find the culprit, with their main suspects being Waylon Smithers and Homer Simpson.

Kuosheng Nuclear Power Plant: The Kuosheng Nuclear Power Plant or Guosheng Nuclear Power Plant (國聖核能發電廠), Second Nuclear Power Plant (第二核能發電廠 or 核二), is a nuclear power plant in Wanli, New Taipei, Taiwan.  The plant is currently the largest nuclear power plant in Taiwan, before the opening of the 2,700 MW Longmen Nuclear Power Plant which is still under construction.

Kaliningrad Nuclear Power Plant: The Kaliningrad Nuclear Power Plant (also referred as Baltic Nuclear Power Plant (NPP) or Baltiiskaya NPP, Russian: ) is a nuclear power plant under construction 13 km south-east of Neman, in Kaliningrad Oblast, Russia.  It is seen as a counter-project to the plan to build the Visaginas nuclear power plant in Lithuania and is considered not only as an energy, but also as a geopolitical project.  In June 2013 the construction was temporary stopped for re-designing the project.

Supporting paragraphs: Waylon Smithers Homer's Odyssey (The Simpsons)
Answer: Mr. Burns