This is the third movie for Half-Life 2. This movie released from Valve at E3 2003, and it shows the section of Kleiner's Lab from Half Life 2.
Gordon Freeman is back! Along with scientist Eli Vance and his daughter Alyx, your mission is to save the world from total alien domination. See, that little incident in Black Mesa was just the beginning: now those pesky Xen invaders have spread across the whole Earth, causing massive amounts of death and destruction. It's up to you to set things right.
Half-Life 2 picks up some time after the original Half-Life left off - with Gordon working for the G-Man - and takes place in and around an eastern European-type city called City 17. Multiplayer will be included, but Valve hasn't disclosed any additional info about online play at this time (although we do know there won't be built-in co-op). For more information, check out GameSpy.com's Half-Life 2 preview.
The game is powered by Valve's new internally developed "Source" engine, and is currently scheduled for a September 30, 2003 release.