Ringworld is based on Larry Niven's science fiction book series from the 1970s and tells the story of Louis Gridley Wu, a bored man celebrating his 200th birthday in a technologically advanced, future Earth. Upon being offered one of the open positions on a voyage, he joins a young woman and two aliens to explore Ringworld, the remote artificial ring beyond "Known Space." The books cover their thrilling journey as they attempt to fulfill their original mission to uncover the mysteries of Ring.