This Real Ghostbusters t-shirt shows the Stay Puft Marshmallow Man wearing a Stay Puft Santa hat for Christmas. In the classic Real Ghostbusters animated series, the Ghostbusters reluctantly released the Stay Puft Marshmallow Man from their Containment Unit to fight a giant monster taking the form of Murray the Mantis that had been spawned from a possessed Thanksgiving Day Parade balloon. After helping the Ghostbusters on Thanksgiving, the Stay Puft Marshmallow Man became a friend and an ally. He was left out of the Containment Unit to celebrate Christmas with the Ghostbusters.