Some best sci-fi movies with good story plot?

[Manoj]

Recently watched the movie limitless.need some good movies like that...can u help me guys?

 

[mmmmrmmm]

Aliens (arguably better than the original).
http://www.imdb.com/title/tt0090605/

Terminator 2: Judgment Day (another movie that is arguably better than the original, an oldie but it's also a goodie).
http://www.imdb.com/title/tt0103064/

Inception
http://www.imdb.com/title/tt1375666/

Avatar
http://www.imdb.com/title/tt0499549/

 

[ReturnOfTheSkyRaider]

I can. I have noted all the best Sci fi movies:

12 Monkeys
Inception
Source Code
Primer
The Island
Donnie Darko

 

[KarenB]

Rise of the Planet of the Apes
The Adjustment Bureau
Source Code
War of the Worlds
Minority Report
The Matrix (first one)
The Terminator (one and two)
Eternal Sunshine of a Spotless Mind (more relationship and sci-fi)
Blade Runner
Tron (the first one)
Brazil
Silent Running
Soylant Green
Omega Man (precurser to I am Legend)
Videodrome
Children of Men
A Scanner Darkly
Roller Ball
Altered States
I could practically go on forever -- love Sci-Fi