McDonald's moon-headed advertising character used during the 1980s was called Mac Tonight.
Mac Tonight was introduced in 1986 in a campaign promoting McDonald's evening business. The character had a crescent-moon head, wore formal clothing, and sang a modified version of “Mack the Knife,” giving the commercials a nightclub-inspired style.
The campaign was notable because it targeted adults and dinner customers rather than focusing only on children. Mac Tonight became a recognizable figure in late-1980s McDonald's advertising, although the character was later retired.
Mac Tonight is distinct from the earlier McDonaldland characters. He was not the Hamburglar, Mayor McCheese, or Ronald McDonald, and his moon-shaped head is the key identifying feature. The character's name is also a branding pun on the phrase “back tonight.”