Gidney and Cloyd are recurring characters from The Rocky & Bullwinkle Show.
The Moon Men appeared in Jet Fuel Formula, the first Rocky and Bullwinkle story arc, broadcast 1959-1960. In this story they come to Earth in an attempt to thwart a rush of tourists to the Moon, only to become media celebrities themselves. They initially succumb to the temptations of fame but soon tire of it. (In Cloyd's words, "It's all so wonderful we can't STAND it anymore!") With the help of Rocky and Bullwinkle, they are eventually able to get home. Gidney and Cloyd return in the second-season story arc, Metal Munching Mice, and in the third season Missouri Mish Mash.
After decades of absence, Gidney and Cloyd return in the 2018 series. Unlike the original, they father and son instead of brothers, and they lose their ability to speak.
Gidney and Cloyd are essentially humanoid, but are depicted as about half the height of the average adult Earth human. Although the narration of the series describes them as "green men," their color varies from scene to scene (including other colors such as orange, tan, and blue). Their skin has black spots, or in some scenes, circles. Their pudgy bodies are pear-shaped. Their onion-shaped heads are bald, save for tufts of hair at the very tops. They have no noses (Cloyd remarks that they have no sense of smell because of this) and they have no visible external ears. Cloyd displays a toothy smile; whatever mouth Gidney may have is concealed by a shaggy mustache. Cloyd wears a belt and holster for his scrootch gun (which has the power to immobilize its targets for a variable length of time). They are otherwise unclothed. Both Gidney and Cloyd possess the ability to disappear and reappear at will; they can disappear completely, but at times their eyes, and/or Cloyd's mouth, may remain visible (in the manner of the Cheshire cat's smile).
Gidney and Cloyd are aliens who live on the moon and are close friends of our heroes, Rocky and Bullwinkle. They often show up to help Rocky and Bullwinkle with their adventures and foil Boris and Natasha's evil schemes. They show up in three sagas.