The Gremlins are a people of sentient humanoid beings. Adult male Gremlins are simply called Gremlins, adult female Gremlins are called Fifinellas, male children are called Widgets, and female children are called Flibbertigibbets. There is also a related race or subspecies known as the [[Spandules]]<ref>As seen in ''[[Winter Draws On]]''.</ref>. Gremlins possess the ability to fly and to teleport at will, and eat used postage stamps. They are invisible to those who refuse to believe in them or who have never flown in any fashion.
The Gremlins once lived in the beautiful forests of [[England]], until World War II, when the British government cut several of them them down for war supplies. In revenge, the Gremlins began to sabotage airplanes in the factories and military airports that had been built over their old homes,<ref>''[[Rue Britannia]]'' suggests that several factories were touched, with one being shut down.</ref> causing them to crash. Fortunately, a British pilot named [[Pilot Gus|Gus]] convinced them that they should join forces to fight against a common enemy, the Nazis. The Gremlins agreed, and each of the Gremlins joined with a pilot, taking on the pilot's name after "Gremlin". The leader of the Gremlins partnered with Gus, becoming [[Gremlin Gus]].<ref>This constitutes the main plot of ''[[The Gremlins]]''.</ref> During the war, a British flight lieutenant and (then-amateur) writer named [[Roald Dahl (character)|Roald Dahl]] found out about them, and published a [[The Gremlins (in-universe)
|The Gremlins|book]] about their story.<ref>The book was shown to exist in-universe in [[Epic Mickey 2: The Power of Two|''Epic Mickey 2: The Power of Two'']].</ref>
After the war, the Gremlins took the sorcerer [[Yen Sid]]'s offer to move to [[Wasteland]], realizing that even with all the goodwill in the world, the modern world was simply no longer for them. There, they settled in [[Gremlin Village]] and became an essential part of Wasteland's society, putting their engineering abilities to good use. Gremlin Gus even became a close friend of [[Oswald Rabbit|King Oswald]]. The Gremlins fought valiantly in the Blot Wars, matching the [[Mad Doctor]]'s mechanical creations blow for blow, which prompted the Doctor to create [[Gremlin Cages]] which blocked their teleporting abilities. Though many Gremlins were so captured, others always managed to free them in the end.<ref>This is all shown or implied in ''[[Epic Mickey]]''.</ref>