Leonard invents the echo or rather, he amplifies it. But his disciple is rather clumsy, the same when it comes to the invention that serves to make disappear and reappear. After that, Léonard comes to hook up the phone with his new neighbour, but this one has trouble using it. Our genius invents the answering machine, but other problems happen. After all this, Léonard has his disciple tested the fastest car in the world, which does not go without a few small incidents, all punctuated by the comments of the chat Raoul. In any case, the hospital can already hold a room, Basile is not far away.