Mac Tonight was the moon-headed singer in McDonald's advertising.
Mac Tonight appeared in McDonald's advertising in the 1980s as a character with a crescent-shaped moon head, sunglasses, and a tuxedo. The campaign used a version of the song “Mack the Knife” to promote McDonald's evening and late-night appeal.
The character was visually different from McDonaldland figures such as Grimace, the Hamburglar, and Mayor McCheese. Mac Tonight's design and lounge-singer presentation gave the campaign a distinct musical style and helped position McDonald's as a place to visit after ordinary daytime meals.
The character is also associated with legal controversy involving the song's rights holder, which contributed to the campaign's discontinuation. Mac Tonight is therefore remembered as a specific advertising character, not as the name of a permanent McDonald's mascot.