Several outlets have published rankings of sci-fi movies, with some focusing on the darkest or bleakest films in the genre. The rankings vary, with some listing specific numbers of top movies, such as the 5 darkest or 10 bleakest, while others provide more comprehensive lists, like the 100 best sci-fi movies of all time. The criteria for the rankings also differ, with some considering factors like the movie's universe, ending, or director, like Steven Spielberg.