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Radioactive Man Icon.png The contents of this article or section are related to the Radioactive Man universe. They are considered fictional in The Simpsons.
Animal Information
Species: Cow
Color: Blue
First Appearance: The Little Boy with the Big Dream

Moon-Cow is cow living in space.


When Radioactive Man heard Danny McKay talking about a Moon-Cow in his dreams he realized that Danny was in another part of the galaxy, in the uncharted space between a grown-up's world and a child's dream. Radioactive Man then flew to that part of space and passed Moon-Cow. Later, Moon-Cow flew over Windy and Mrs. McKay when they were in that part of space.

Behind the LaughterEdit

Moon-Cow is a reference to the nursery rhyme "Hey Diddle Diddle", in particular the line "the cow jumped over the moon".