After tonight, one will live and one will be dead.

Fine. I’ll spoil it. 24 has a sixth season coming and Kiefer Sutherland has a contract for at least two or three more seasons after the one that is finished tonight.

Alias was cancelled roughly five or six months ago, despite preperations in the fall of 2005 by the writers for sixth season with a second generation cast.

The theoretical reasons are supposedly here. I reserve judgement on that article; I have not finished reading it yet.