What if, How, And will it be accomplished.

I've been having some "what if" and "how will" and "how can" thoughts today, I don't know how to accomplish them, I was thinking, "Hey I wonder if we could have like, a SMG drop in one of the maps and be able to shoot zombified aperture workers", And Suddenly, pop, It came to me.


...Zombies
We should probably use zombies from the HL series, and somehow headcrabs find aperture later on in the story, survivors from aperture would be found from, Ahem, "Android Hell", And They could sort of be rebels like from Half Life. You decide.