The Day the Earth Stood Cool

"The Day the Earth Stood Cool" (also known as "The Day the Earth Stayed Cool" ) is the seventh episode of season 24. It was set to air on December 2, 2012, but was then moved to December 9, 2012. The episode ending with the shorts, A Brief Message About Artisanal Nuclear Power.

Plot
Homer visiting the playground with Bart where he is called grandfather which made him annoying. At work, Homer sees that his colleagues are eating Devil Donuts but they are out, he calls to the police and they start together look for the vendor that sells those donuts. They find the vendor who has ran out of donuts for the day. The owner Terrence let Homer taste a new variety he is creating, and he likes it. They start talking and it appears that Terrence is a dad, Homer is surprising since he's cool which he's not anymore. Terrence tells Homer that you can not stop living just because you have children. Terrence says his family is from the Portland, and they're looking for a new place to move in. Homer says that his neighbors house is for sale. Terrence decides to buy it and he renovating the house.

The Simpson family visiting Terrence and his family for welcome them to the neighborhood. Lisa loves how the family lives while Bart think they are boring and go home. Marge talking with the mother, Emily, and when she starts breastfeeding her baby, Corduroy she becomes uncomfortable for she is not breastfeeding Maggie. Marge is about to tell Homer that she does not like the family when she is shocked when she learns that Terrence has shaved Homer. Terrance and Lisa continue to hang out with their new neighbors, Marge thinks they should calmly down with their new friends for they not live the same lifestyle. Homer tells then that they are cool which he is not, Marge tries to comfort him by saying that he is cool and always have been. Homer and the kids are with Terrance and his son on several events and having fun. Marge does not like how the kids and Homer has changed since they met their new neighbors. T-Rex has his birthday and to fit in at the party pretending Marge that she is breastfeeding Maggie, but when they find out the truth, at she gives her replacement wanted the other mother breastfeed her but Marge don't let them. T-Rex opens his presents and he mocks Homer's gift which made Bart angry and they start fighting. Terrence's family ends associate with Simpson after that. Homer miss his new friends. Ned Flanders tries to unite the two neighbors but fails, instead call the new neighbors their friends are from Portland and they moves in and takes over Springfield.

Homer and Marge do not like what happened to their city, the cool is all over. T-Rex and Bart have become friends again and T-Rex watching TV with Bart and forget to turn the family's compost making their house catches fire. Homer and Marge visit Terrence and Emily at a festival trying to get them to be kinder to them. During the discussion they smell the smoke from the house and they call the fire department who have lost their horses and can not put out the fire. They trying to us the hoose but the water has run out. The Simpson family tries the through the fire with the infant formula and manage to do it. Emily thanks Marge for her milk saved their homes. Marge acknowledges that she feels a little ashamed that she just breastfeeding Lisa. Lisa says that The New York Times exposure to Springfield USA's as the coolest city. The families from Portland leaves then Springfield, Lisa is sad and tell them at she will find them again.

A Brief Message About Artisanal Nuclear Power
Mr. Burns and an old man talking about how they made the electricity in the past. They panned atoms in a lake and cleving them by hand. They stirred and blown by hand and before the power ending in barrels that were connected into the house. Then starts Burns and the man digging in a mountain.

Reception
An update was released on The Simpsons: Tapped Out to tie-in with the episode, which referred to this episode as airing December 2, 2012 (not directly). The update was later re-released, and when it was, it referred to the episode as airing December 9, 2012 (not directly), the correct date.

Production
On December 10, 2012, the storyboard, the animatic and the full color images of three scenes from the episode were posted on Pinterest. A few images also showed Emily's original design.