Ches and Mo become surrogate parents as well as living play-toys for an irritable 600-pound Baby Pookers left on their doorstep. After eating the carpets and soiling enough diapers to top off a landfill, it becomes clear what the gigantic infant's real purpose is for dropping in on our duo.

Mo's under the weather, which yields a trip to the pediatrician. But Ches is the one inadvertently ushered into the examining room and diagnosed as a rare rat-boy, while Mo's detachable body parts entertain kids in the waiting room.

Mo's sonic snoring tops a litany of annoyances that prevent Ches from getting a good night's sleep. And when Mo's body goes sleepwalking, an exhausted Ches tows Mo's head along in middle of the night on a city-wide search for the monster's torso.