Which advertising agency created McDonald's famous 1970s campaign featuring the McDonaldland characters?

Needham Harper Steers created McDonald's famous 1970s advertising campaign featuring the McDonaldland characters.

The agency developed the fictional setting and its cast as a way to give McDonald's advertising a consistent fantasy world. Characters such as Mayor McCheese, the Hamburglar, Grimace, and Captain Crook made individual products easier to remember and gave television commercials recurring story elements.

McDonaldland advertising became one of the most distinctive examples of character-based fast-food branding. Its imagery was aimed especially at children, although the campaign also strengthened recognition of the McDonald's name and menu.

Later agencies and later campaigns are often associated with McDonald's slogans, which can lead to confusion about the creators of McDonaldland itself. Needham Harper Steers is the agency connected with this character world.