To celebrate the momentous 138th episode of The Simpsons, Troy McClure hosts a retrospective of classic moments and never-before-seen outtakes. As a reward to the show's loyal viewers, a number of long-unanswered questions, like "What's the deal with Mr. Smithers?" are finally addressed, sort of. Also answered is the question, "Who are Matt Groening and James L. Brooks?" As the 138th episode spectacular makes clear, Groening is an America-Firster with an itchy trigger finger and Brooks is the lovable Mr. Moneybags from Monopoly.