Most games these days have trailers. Some of them are great. This is the thread for those.
You can define 'great' any way you wish: intro cinematics vs. original content, representative of the game or otherwise, gameplay footage vs. target renders vs. CGI, all that stuff is your call.
A few to start us off with:
Alien eat your heart out.
The first minute is skippable. The reversal/retraction of the drill makes me wince every time.
Love the music. There's another one out there set to 'Barra Barra' which is pretty awesome too.