Being a die-hard sci-fi fan i watched most of the good [and bad] movies out there on the internets, so I thought you guys could recommend me some good [or awfull] ones i haven't watched yet ^^
lets see what you got!
UPDATE!!!
Movies already commented on the thread: (feel free to talk about them though^^ the ones with the * are the ones i found out about here!)
Serenity
Firefly
Pandorum
Outlander
Battlefield Earth
Hitchhikers guide to the Galaxy
Fire in the sky or Communion
Star Trek Movie Series
2001 a Space odyssey
Event Horizon
*Gor and Outlaw
*Mr Nobody
*Communion
5th Element
Ultraviolet
Silent Running
Riddick series
Logans Run
Blade Runner
Solaris
Inception
District 9
Red Dwarf
Akira
28 days later
I am legend
Idiocracy
Moon
Cloverfield
The Road
*Lost Memories
*Avolon (polish/japanese)
Dark Shadows
*Dark Star
They Live
Splice
Avatar
Equilibrium
*Space Battleship Yamato
*Natural City
*Returner
In Time
A Boy and his Dog
Space: Above and Beyond
*Colossus - The Forbin Project
Super 8
The Darkest Hour
Transformers 1,2 and 3
Ji Joe:The Rise of Cobra (don't, just don't)
Captain America:The First Avenger (lol, it's sci-fi, after all...)
Inception
*Cargo (go watch this, its awsome!!!!)
Alien series
Sunshine
Supernova
War Of The Worlds
Independence Day
Evolution
Predator
I Am Legend
Cocoon
*Scanners
*Death Tunnel
*The Descent part 1 and part 2
The Woman in Black
*Abre Los Ojos
1984 (good, but does not compare to the book)
Primer (if someone understood it, please explain to me!!!)
Farenheit 451
*The Cell
The Island
Star Wars
Space Balls
Mad Max
Pi
Babylon AD
Moon 44
Prometheus
John Carter
The Matrix
MIB
Abyss
Flash Gordon
*This Island Earth
*Lifeforce
Iron Sky
Defiyng Gravity (GO. WATCH IT. NOW!)
*Primeval
Another Earth
Source Code
Stargate
The Fly
*Night Watch and *Day Watch
Frequently Asked Questions About Time Travel (hilarious!!)
Dune (2000) and *Children of Dune (2003)
*Demolition Man
*Galaxy Quest
Monsters vs. Aliens
The Last Starfighter
The Thing (2011) and The Thing (1982)
*Titan A.E.
Total Recall
Falling Skies
Thanks guys, you are making this an awsome thread, keep up the good work!!!

Star Wars Saga
Star Trek The Wrath Of Khan
They Live
Battlefield Earth
The Matrix
Pitch Black
The Chronicles Of Riddick
MIB
Avatar

Dude, ive been following this movie since it was greenlighted, im a huge fan of the alien trilogy, and I love Riddley Scott

KHAAAAAAAAAAAAAAAAAAAAAAAAAAAAN!!!!!!!!!!!!!!!

Abyss, whilst not true Sci-Fi has an interesting end

Flash Gordon
The Event Horizon
The 5th Element

This Island Earth

I think you'll find there are 4 Alien movies.

and pretty soon five.
Wow ! A five piece trilogy !

yup, there are, but i prefer to pretend the fourth one doesn't exist... im happier this way...

not realy... Prometheus isn't acualy part of the Alien series, it just takes place in the same universe... Kind of like tarantino's movies