Which moon-themed McDonald's character promoted late-night dining in 1986?

Mac Tonight promoted McDonald's late-night dining in 1986.

The character was a fictional crooner with a crescent-moon head, dark sunglasses, and a tuxedo. He appeared in a series of television commercials designed to encourage customers to visit McDonald's during evening hours, when the chain wanted to build stronger demand.

Mac Tonight's advertisements used a rewritten version of “Mack the Knife,” a song associated with Bobby Darin's 1959 recording. The character's lounge-singer style gave the campaign a markedly different tone from McDonald's child-focused McDonaldland advertising.

Mac Tonight is often remembered as a permanent mascot, but he was primarily the face of a late-night advertising campaign. His popularity was strongest in the United States during the late 1980s, and the character was later retired from U.S. advertising.