Geronimo Stilton is a best-seller in the category of children’s book series. In this 4th part, Geronimo Stilton rallies the external universe in this celestial fun series. The space mice have got the invitation to join the intergalactic space soccerix championship. It is the name of a very famous competition that is held in space. Although, Geronimo is an invitee into the game, he does not even know how to play the game. And eventually being unknown to the format of the game, he has to lead a whole team to triumph against the aliens, who have weird talents like FLYING! How will Geronimo perform his duties as a team leader for a game which he himself is not able to play?