The answer to the crossword for the term 'Founder of Sci-Fi' is Jules Verne (5 letters). Jules Verne was a French novelist, poet, and playwright who is widely regarded as the founder of the science fiction genre. He wrote some of the earliest works of science fiction, including Journey to the Center of the Earth, Twenty Thousand Leagues Under the Sea, and Around the World in Eighty Days. His works have been adapted into numerous films, television series, and video games.