In Ghostbusters, what is the name of the marshmallow giant attacking New York?

In Ghostbusters, the marshmallow giant attacking New York is the Stay Puft Marshmallow Man.

The character appears during the film’s climax when the Ghostbusters confront Gozer, a powerful supernatural entity. Gozer tells them to choose the form of the destroyer, and Ray Stantz accidentally imagines the cheerful Stay Puft mascot from a marshmallow brand. That harmless thought becomes a gigantic supernatural figure.

Stay Puft is deliberately comic because the enormous creature looks friendly while threatening the city. The contrast between a familiar food mascot and a destructive monster became one of the film’s most memorable visual jokes.

The 1984 film was directed by Ivan Reitman and starred Bill Murray, Dan Aykroyd, Harold Ramis, and Ernie Hudson. The Stay Puft character is often mistakenly called simply “the Marshmallow Man,” but the canonical name includes “Stay Puft.”