It's a Massmouth Christmas special! Massmouthmas takes place after the events of Massmouth 1 but before Massmouth 2. The protagonist Massmouth is on winter vacation in a remote cabin when employment benefactor The Worm calls over video with an urgent problem. A friend of The Worm owns a toy factory near Massmouth's holiday spot that is malfunctioning and it must be fixed immediately. With a promise of compensation, Massmouth heads out into the cold see what they can do.