10 Greatest Sci-Fi Masterpieces of the 20th Century, Ranked

Science fiction has always been the genre where filmmakers could dream bigger, ask harder questions, and imagine futures both dazzling and frightening. Through it, directors and writers could explore real-life topics under a heavy coat of genre filmmaking, resulting in many of the last century's most profound and insightful efforts. In some ways, it was the defining genre of the 20th century, reflecting that period's rapidly advancing technology in all its wonder and terror.