The moon-headed McDonald's advertising character introduced in the 1980s was Mac Tonight.
Mac Tonight was created for a McDonald's advertising campaign and appeared as a character with a crescent-moon head, sunglasses, and a tuxedo. His commercials used a jazz-influenced version of “Mack the Knife,” linking the character to an evening dining message.
Mac Tonight is often confused with fictional moon mascots from other advertising campaigns. He was not one of the original McDonaldland characters and did not represent breakfast. His name was a pun on “Mack the Knife,” while the character's moon design emphasized nighttime restaurant visits.