Wanting to be more inspiring role model to her children, Marge gives up her apron for academia. Lisa is inspired, indeed, and undertakes the tutelage of Maggie. But Maggie's favor becomes a point of contention between Bart and Lisa who have a battle of the brains over their power-shifting sibling. And when Professor Frink's Embigulator goes missing, it is all but certain the culprit is Bart Simpson. The only question is, who will be embiggened! And finally, Milhouse gets a new look for School Picture Day!