Cantinflas, the boyfriend of the servant of a rich industrial man, gets into the house in order to kill a mad dog. Suddenly this man appears so the servant tells him that Cantinflas is his wife's brother (Leonardo), who had been lost for years. The rich man then remembers that his father in law's testament could only be paid when all brothers get together, so treats Cantinflas, a real bum, as a king.
Julio Cesar (Enrique Herrera), writer of soap operas, is very upset nerves. Dr. Jimenez (Alberto Galán) recommends an institution that will give he a therapy to cure these scares. To avoid exposure to bad publicity, is camouflaged by the pseudonym Justiniano Conquian . By chance, a taxidermist (Joaquin Pardavé) also named. His case is different: it is a millionaire heir heritage potential, but will only be legally recognized if it meets a peculiar condition in the will, having to spend a whole month in the gloomy castle Conquian, competing with other heirs of fortune. Dr. Jimenez is bribed by a cousin of Justinian to send the false Conquian scares Castle into thinking that is the sanatorium.
Two con-men end up at a country estate, where they thwart some jewel-thieves.
A freeloader goes through a case of mistaken identity after a man tries to blackmail a married woman and he's caught in the middle of everything.
Victor must leave his life of partying and change his girlfriend, Lucero, for the bride that awaits him in his hometown.
Shabby-genteel big city family tries to marry their daughter off to a wealthy landowner from the southern provinces.
