Dani Tomás (Berto Romero) is a television screenwriter disillusioned and bored of his work. One day he receives unexpected news: for a legal error he must repeat eighth grade. Now, he returns to a world he already thought he had forgotten, living new experiences and experiencing a multitude of unexplained situations and hilarious events. But he will not be alone in this epic adventure, because he will have the help of the peculiar director of the school (Carlos Areces), a police officer (Antonio de la Torre, May God forgive us) and an enigmatic classmate (Carolina Bang).

Joe Baker has a dream. He wants to do 'something big.' When he needs a Gatling gun to accomplish this, he seeks out a black marketeer. The price he wants for the gun? A woman! So Baker kidnaps a woman off of the stagecoach, only to find that she is the wife of the commandant of the local Cavalry detachment. Things get further complicated when a girl named Dover McBride shows up. She has come to force Baker to marry her and return east, as he promised to do four years earlier