McDonald's moon-headed advertising character from its late-1980s campaign was Mac Tonight.
Mac Tonight was introduced in 1986 to promote McDonald's evening and late-night business. The character had a crescent-moon head, wore formal clothing and sunglasses, and sang a modified version of the song “Mack the Knife.” The campaign connected McDonald's with nighttime dining rather than focusing only on daytime meals.
The character's name is a pun on “Mac” and “tonight,” directly reinforcing the campaign's time-of-day message. Mac Tonight was especially associated with advertisements aimed at adults and late-night customers, which made the campaign different from McDonaldland promotions aimed at children.
Mac Tonight is sometimes confused with McDonaldland characters such as Ronald McDonald or Grimace. It was a separate advertising creation, used in a campaign centered on the evening hours.