When it comes to finding science fiction films on Netflix’s instant streaming services, your choices are mostly limited to the classics (“Metropolis,” “The Day the Earth Stood Still,” “Close Encounters of the Third Kind”) and a whole lot of direct-to-DVD garbage (would you rather sit through “Mega Shark vs. Mecha Shark” or “Starship Troopers 2: Hero of the Federation”?). Inspired by the release of the Tom Cruise vehicle “Edge of Tomorrow,” which opens today, I decided to compile a handful of overlooked films that belong to a genre which is so frequently mishandled and disrespected. Here are five, in alphabetical order: • “eXistenZ” (1999) Canadian auteur David Cronenberg (“Videodrome,” “Naked Lunch”) has always used hallucinogenic imagery, flagrant sexuality and gooey special effects in his work, and “eXistenZ” plays out like a winking compendium of all his pet themes. Jennifer Jason Leigh stars as a video game designer whose creations involve deeply immersive virtual reality – umbilical-like cords are plugged directly into players’ spines – and she’s on the run from a crazed fan who wants her dead. With her impromptu bodyguard (Jude Law), she must retreat into the realms of her own game before she and it are destroyed. The film was unfairly compared to “The Matrix,” which had taken over theaters a month earlier, and was effectively buried, but it’s a crafty, twisty, darkly funny head-trip.