Dumbsday! is the eightieth comic issue, released on 24 August, 2016  in the US.
When President Nixon discovers that the population is getting too smart to re-elect him again, he gets Dr. Wernstrom to create a machine that will make everyone stupider until Election Day. However, the Dumbsday device affects everyone but Fry, making him “the smartest man in the world.”
Nixon is in a political debate against the Visible Woman, Bernie Burnman & the cloned head of himself. A member of the media reveals that they have decided to let the audience ask Nixon some questions (instead of the pre-prepared ones), which results in him offending a pair of frost giants (who have previously voted for Nixon three times). Meanwhile, at Planet Express, Fry accidentally gets popcorn all over the lounge, causing the others to insult his intelligence and laugh him out of the room. Nixon later consults with Dr. Wernstrom about raising his number of voters on Earth (which currently stands at a total of 85) by making everyone stupider. Wernstrom devises a plan to send out a baby Brain Spawn's intelligence-reducing waves through an antenna that will reach everyone on the planet.
- Bernie Burnman is a cross between Marvel's Human Torch and American politician Bernie Sanders.
- The head of the titular character from the Cartoon Network series Steven Universe appears in a garbage pile.
- (In alphabetic order)