Sometimes the premise of a game is so absurd you have to have missed something. That, or designers were all, “Plot? Plausibility? I’m not even worried about that stuff. Hey, do we need more or less zombies?”
Cracked asked readers to submit deleted scenes from video games that might help explain just exactly what’s going on. There are a few here:
#14 by blybug:
#10 by JonChacon
#8 by rippletron
Check out the rest on Cracked.