The fourth episode of the Interstellar Odyssey series concludes the story of an extraordinary adventure, conceived with the help of scientists: the launch of a space exploration probe destined for a distant exoplanet, in search of extraterrestrial life, potentially intelligent. How can such a mission be conceived, and how can we detect life and its potential traces in the universe? What forms of life might we expect? How would we react to the discovery of extraterrestrial life, and can we survive long enough to find out? Between science and imagination, the film attempts to answer these many questions.