Kicking off the list at 50 we have:
50: Stargate – An Emmerich early bird and the only Emmerich film in the list. It was kind of cheesey but it bought together two great genre’s, archaeology and sci-fi. Would be higher in the list if the series hadn’t ruined it.
49: Serenity – A surprisingly good romp that demonstrates fan power. Even if you are not familiar with the Firefly tv series this is worth a watch.
48: Ghost in the Shell – Our first Anime entry, one of the all time great Anime films some would argue this should be higher but I fell asleep whilst watching it which gets an immediate penalty.
47: Cloverfield – Almost didn’t make the list, the beginning was boring but did make up for it once it got going. Happy ending.
46: Chronicles of Riddick - Monumental failure at the box office and for no good reason really. Very reminiscent of classic sci-fi literature and vin diesel really does the part justice, feels like a film from a different era.
45: Enemy Mine – Brokeback mountain in Space.
44: V for Vendetta – There was widespread discussion over whether this was actually sci-fi. In my book anything dystopic is sci-fi and I get the overruling vote.
43: The Thing From Another World – Howard Hawks classic about an alien plant creature that formed the basis of John Carpenters re-imagining. Really enjoyable 50′s paranoia sci-fi.

Strange I thought it would be Bigger
42: Dark Star - John Carpenter gets another mention, he will not get another one for Ghosts of Mars! College project with bouncing alien ball works well for me.
41: Akira – The ultimate Anime film, things are on a young mans mind and he threatens to destroy the universe for it. You got to love those anime films.
40: Pitch Black – Slightly subtler introduction to Riddick and a low budget make this very much worth watching.
39: The Thing - See John Carpenter again. Its not massively high brow but seemed to take on more significance with the discovery of Aids/HIV. Awwww poor husky.
38: Equilibrium - Probably the surprise factor more than anything else. Good sci-fi with good action.
37: 1984 – Epic and dystopic, we love it.
36: Zardoz – Widespread nudity makes this a winner, also flying statue heads.
35: Event Horizon – Gory spaceship with gore and guts all over the windows sends people mad, big spinny spikey thing has something to do with it.
34: Dune – How this film ever made it into the list with all the production problems and quickshot story telling is a testament to how far a sci-fi fan will overlook things to see some giant worms.
33: Logans Run – Peter Ustinov and Jenny Agutter give this a win. Michael York I could do without.
32: Invasion of the Body Snatchers(1956) – Don’t fall asleep. No I said don’t, okay you’ve been secretly replaced by a pod.
31: Planet of the Apes – You maniacs!

30: Demon Seed – Whoah, weird robot computer rapes woman to make new species of life. Whoah.
29: The Day the Earth Stood Still(1951) – Stop building nuclear weapons! That worked then.
28: Star Wars VI: Return of the Jedi – Ewoks kind of ruin what is one of the ultimate show downs in movie history.
27: The Abyss – Who would of thunk there was things in the abyss.
26: Farnheit 451 – Well looks like we got ourselves a reader! Again dystopia rules. Maybe I’m a pessimist but I can’t think of a utopic sci film.
25: Total Recall – Two weeks etc. Get your ass to mars and watch this movie.
24: Invaders from Mars(1953) – Beware the sandpit at the bottom of the garden there is a guy in a jar who will take over your mind. We love these 50′s sci-fi movies.
23: War of the Worlds(1953) - Looks like 1953 was a bumper year for sci-fi. This really is an iconic film and the special effects were inspired.
22: When Worlds Collide – A curious documentary which investigates how wrong humans can get it when it comes to choosing who should continue the human race on an alien world. Featuring the biggest skateboard ramp ever.
21: This Island Earth: There was a moral in this film somewhere something about white hair.

Triangular TV's never caught on Bizarrely
20: Silent Running – Shhhhhhhhhhhh don’t disturb the trees or I will kill you.
19: Predator – Action, bullets and a weird ass invisible creature that has a nuclear weapon stapled to its arm make this probably the best sci-fi ever bar everything else on this list.
18: Terminator 2 Judgement Day – pre-post apocalyptic robot from cyberdine systems forms a lasting relationship with a wayward child. This unlikely relationship takes them on an emotional journey which leads them both to realise that skynet will attempt to destroy the human race. Luckily they manage to destroy all future tec which could lead to the creation of skynet thus ending the franchise.
17: Close Encounters of the Third Kind – so its a bit disney but it turns out that music is the universal language and not maths at all. Bravo on the mashed spud mountain.
16: Metropolis(1927) – Not sure what this is about but a robot gets animated into some sort of dancing floozy. Or did I dream that.
15: The Matrix – There is no spoon.
14: A Scanner Darkly – Playing an undercover narc whose brain gets addled by death somehow suits Keanu Reeves. Also more excellence from Robert Downey Jnr.
13: Star Trek: The Motion Picture – V’ger wants to communicate with the creator and is really pissed off!
12: The Quatermass Xperiments -Nigel Neale + Hammer Productions + BBC = groundbreaking sci-fi.
11: Twelve Monkeys – This film should be a lot more complicated than it is. As it turns out it wasn’t complicated at all even with the time travel and all that jazz.
10: Forbidden Planet = Uber sci-fi, in fact almost archetypal and Leslie Nielsen shirley can’t be in it. Monsters from the id rock.

It's a Toaster
9: Quatermass and the Pit - Great story, what can you say.

I think the SFX guy worked on Dr. Who
8: Aliens - Guns, marines, a mother alien and a robot fork truck thingy but an annoying kid that doesn’t die a horrible death means this film drops a couple of places. Still a resprectable 8 though.

That Annoying Kid must surely Die
7: Star Wars IV A New Hope - May the force kill the death star with womp rats not much bigger than two meters.

What were you thinking in wearing that?
6: Terminator – Sarah Connor, Yes, *boom*. Oscar winning dialog.

Obviously a Robot Governor from the Future
5: Village of the Damned(1950) – Creepy kids with Akira style powers. Kids are scary!

Why do they all have such odd Hair? Arggghhh
4: 2001: A Space Odyssey – Open the pod bay doors please HAL you mental case.

Is that Jesus?
3: Starwars V The Empire Strikes Back – Star Wars Radiohead style. One wonders what would have happened had Luke joined up with Darth to take over the universe. Where does the emperor fit in with this plan?

He's just a rip off of Dark Helmet
2: Alien – In space no-one can here Ripley being all sanctimonious and so full of her own sense of worth that jones her cat would rather take its chances with the alien and an exploding space freighter. The cat loses.

Couldn't find an NHS Dentist huh?
1: Bladerunner – was there ever any real doubt?

Keep Running
And thats it. Agree, disagree or whatever, I’m sure we’re right