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