We all have our movie blindspots, movies that we know we need to see but simply haven't gotten around to seeing yet. Sometimes, it's because a movie isn't on DVD and can only be seen when a rare film print makes its way to the dingy independent theater on the bad side of town. Sometimes, it's because the movie is supposedly "important" and "important" movies are daunting and often boring and if you say you don't like it, you'll find a dozen film fans jumping down your throat, demanding to know why you're such a loser and why didn't you get it and you obviously weren't giving it your complete attention-

You the get the point. What I'm trying to say is that io9 has compiled a most excellent list of classic science fiction films that everyone must see. Sort of a Science Fiction Films 101 sort of thing. Twenty five films, from 1927's Metropolis to this year's Inception, that should form the basic core of any sci-fi junkie's film education. Not to brag, but I've seen all of 'em. How about you?

It's a great list, even if a few choices feel like the writer's personal favorites instead of important milestones (but that's a given with any movie list not written by a machine). It's also a good conversation starter: what are your must-see science fiction movies? No, not personal favorites, but movies that you feel are genuinely important to the genre and need to be seen by anyone seriously interested in the craft of filmmaking and film appreciation.

What? You're asking moi? Okay...

Metropolis: Yeah, it's an easy answer, but it pretty much set the standard for what science fiction would like on film for decades to come. Anyone who works in the sci-fi genre and claims that Fritz Lang's silent masterpiece has no influenced him is a dirty liar.

Alien: The single most successful example of combining horror with science fiction, this is the rare film that features an alien ripping its way out of a man's chest while remaining classy and sophisticated. Watch it in a double feature with John Carpenter's The Thing for a great evening.

Brazil: This is the best example of a film using science fiction for social satire. A frightening and hilarious look at bureaucratically fascist world that doesn't feel too removed from our own, Brazil remains as relevant as ever.

Of course there are more, but that's where you come in. What are your essential science fiction movies?