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- Sillage: A species developed as clone soldiers with minimal intelligence. Even when freed, the one intelligent member of their race says they don't know what to do with themselves.
- The goblins in House of Mystery aren't a bright lot, with one character being an exception.
- A strange case in Marooned as there is very brilliant species thats brains in robot bodies. They couldn't manage to land their highly advanced ships. When one ship was saved, two of those died by accident while exiting the ship. Out of all the crew in ship, only one survived.
Films — Animation
- While not stupid, the little three-eyed martians from Toy Story seem to be quite gullible.
Films — Live-Action
- Humans might be considered this if you've seen the movie version of The Hitchhiker's Guide to the Galaxy. That might be because Humans Are Morons.
- In Mom and Dad Save the World, the inhabitants of the planet Spengo aren't too bright.
- Earth's future in Idiocracy. Apparently everyone becomes a moron.
- The aliens in Galaxy Quest are pretty childlike and innocent.
- Legacy of the Aldenata: the Posleen are an incredibly stupid variant of the Horde of Alien Locusts. This was done in order to make space aliens that can attack but still be defeatable.
- The ogres in Xanth are stupid and proud of it.
- Discworld has the Stupid Lizard Men. That's actually what they're called. They're all called Slime, since they can't remember any other names. As of The Last Hero there was believed to be only two left, but over the course of the book there was a battle in which they were both killed. By their own weapons.
- Trolls are a subversion; in Ankh-Morpork, they all seem to have rocks in their head metaphorically as well as literally (not that you'd say that to their face) but this is because they come from cold mountains. In optimal temperatures, their brains work fine, sometimes even better than humans'. The trolls that decide to go to Ankh-Morpork are the smart trolls, they just have trouble functioning in the heat.
- In Nine Princes in Amber, Corwin forms an army by recruiting entire species of creatures that are brutish, but a little slow. They also happen to have a predilection toward hero worship. This is all justified by the fact that as a Prince of Amber, Corwin can walk through Shadows until he finds one with an ideal species to recruit.
- The Hork Bajir from Animorphs were designed by the species that created them (to be gardeners of a sort) to be peaceful and not terribly bright. Occasionally one is born with human-level intelligence though.
- The Ogrons of Doctor Who are explicitly Too Dumb to Fool.
- The episode "Samaritan Snare" featured the Pakleds in Star Trek: The Next Generation. They're a bit of a zig-zagged example, as while they are genuinely stupid, they're still smart enough to go for Obfuscating Stupidity so they could steal technology. Pakleds do show up as non-speaking characters in later episodes, all in positions which would require at least some basic intelligence (such as mechanics — the Pakleds in "Snare" had problems with basic maintenance of their ship), it's also likely that the "Snare" group of Pakleds were dumb even by Pakled standards.
- Dungeons & Dragons: Many mookish monsters have their mental stats lowered in this way.
- Orcs has lower Intelligence and Wisdom caps in AD&D2 and penalties to intelligence in 3.5 Dungeons & Dragons.
- Lizard Folk, Minotaurs and most goblinoids has the same or worse hindrances.
- Ogres are dumb, but have also Oni-like Ogre Magi race who tend more toward "devious" and look down on those brutes.
- Warhammer 40,000
- Ogryns: those who show an exceptional level of intelligence (something like a four-year-old's) are surgically enhanced to be marginally smarter. They're called Bone 'Eads and get lumped with ordering their dumber allies around. They all still come across as Psychopathic Manchildren though.
- Orks in the same setting (being the comedy relief, they go for Too Dumb to Live with great regularity), though they are also brutally cunning on the rare occasion that they aren't cunningly brutal.
- Played for laughs in the Toon supplement Tooniversal Tour Guide. The "Star Toon" setting features the Bozonians, a race of pigeon-people who are so stupid they can perform seemingly-impossible feats of science and engineering.
- Considering each sample of DNA in Ben 10's Omnitrix represents a species, Rath's race seems to be superstrong, arrogant, and kind of stupid.
- The Jakovasaurs from South Park (which were an obvious parody of Jar-Jar Binks) are a race of morons.
- The Ogres in Adventures of the Gummi Bears are all pretty dumb, bordering on Minion with an F in Evil. The one smart Ogre, Toadwort, is about as tall as a human five-year-old and is routinely abused by his brother Ogres and his boss, The Man Behind the Monsters, Duke Igthorn.
- In one episode of the Mr. Bean animated series, it's revealed that Mr. Bean is actually from a planet where everyone looks and acts exactly like him.