Leo and the Alien is a story about five boys who play basketball together. When they become bored with the traditional two-basket game, they invent a new game by adding a third basket and another ball, requiring three teams to play. Little did they know that an alien from the planet Zenon would observe the clever take on the traditional game. The alien approaches the boys and invites them to come to his planet to show the other aliens there how the game is played. The aliens love the game and the Alien-Human Basketball League starts an unlikely friendship between the people on Earth and aliens on Zenon.