Half Life 2 episode 1
Music form the game and trailer
Half Life zombies (but just stand still and attr=ack if you're in front of them)
Practically a perfect port of a couple of maps to L4D
Has a Gauntlet crescendo (which is in L4D2)
Cons:
None
Conclusion:
It's fun to play L4D in a Half Life world. Full of zombies, but no Gordan Freeman here.
Pros:
Cons:
Conclusion: