If you could have any two game companys work on a game.

[Cheesus333]

Blizzard and Valve, to make an amazing FPS [footnote]I'm thinking of Half Life 2[/footnote] RPG [footnote]I'm thinking of Diablo II[/footnote] that would never be released.

EDIT: And scrolling up, I see someone else had the same combination. This is a good thing

 

[Lucifer dern]

Bethesda and Blizzard. Bethesda is awesome at huge sprawling worlds with awesome stories that just sometimes lack a bit of polish (especially new vegas which was loaded down with bugs at first) and blizzard is really good at releasing things that are polished to a mirror shine. Besides, who wouldnt want a combination of Diablo and fallout 3?

If it was three I'd add bioware to that...but other wise...ninja!!!!