Deadline Games (Total Overdose, Chili Con Carnage) showed of the first trailer from their upcoming Watchmen: The End is Night downloadable episodic prequel at the Spike TV Video Game Awards recently. The game will feature Rorschach and Nightowl fighting thugs in the 70's, while the upcoming feature film is set in an alternative 1985.
Watchmen: The End is Nigh will be available as downloadable episodes on PC, Playstation 3 (PSN) and Xbox 360 (XBLA).