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Although he knows that his pregnant wife Wilma needs some help around the house, Fred would just as soon not have his mother-in-law move in. Thus, he hires a sweet-looking old lady to serve as housekeeper. Unfortunately, the old dear turns out to be the notorious bank robber Grandma Dynamite, who is in desperate need of a hideout and headquarters for herself and her musclebound henchman. Needless to say, the climax of this episode is an explosive one indeed!