But the genre has plenty of other fantastic films to offer.
In Donnies absence, a jet engine crashes into his roomand then things get weird.
But the more they do it, the more complicated things get and might spiral out of their control.
It was directed byJames Cameronand starsArnold Schwarzeneggeras the titular Terminator and helped to launch both of their careers.
The film has since spawned a huge franchise, from movies and TV shows to comics.
And in the end, both the researchers and audiences are left with more questions than answers.
Image via Pandora Cinema
As sci-fi often does,Inceptionpresents not just new technology but an examination of reality.
The movie was directed byTerry Gilliam.
It is distinctly Gilliam, with amazing and at times bizarre visuals, and is perhaps his best film.
Image via StudioCanal
One agent, Wikus, is infected with an alien virus that might change him permanently.
District 9is a modern classic and sci-fi masterpiece that serves as a metaphor for apartheid.
The film is remembered as much for its effects and style as it is its plot.
Image via Orion Pictures
Star Warsis a classic sci-fi movie and is among the most famous and most successful of them.
It was produced and directed byStanley Kubrick.
2001received mixed reactions when it was first released, but is regarded as a classic now.
Image via Paramount Pictures
NEXT:The 10 Best Sci-Fi Movies of All Time, According to the AFI
Image via Warner Bros.
Image via Warner Bros.
Image via 20th Century Studios
Image via Metro-Goldwyn-Mayer
