Gloria Ruckhauser has a dream: rediscovering the figure and features of herself when she was 20. Convinced that science is getting nowhere in the search for a cure to the aging process, Gloria sets up a foundation whose mission is to find a miracle potion. Various scientists take up the challenge and develop a substance that reverses the biological clock. Now, they face a new challenge. How to stop getting younger before it's too late.

In a world ravaged by violence, and other serious social problems, Joan - a character that alludes to Christ (which represents the return to Earth) arrives to Italy by train and preaching for the salvation of mankind, condemning the hypocrisy and hedonism.

1975 film by Adriano Celentano, Miki Del Prete