Well, naturally. This is how we assumed the make-up of the five different armies featured in Risk: Factions would evolve: first, there are humans, and then there were cats, who were bested by robots, and now somehow there are zombies. You wouldn't think them to be brilliant global strategists, but judging by their introduction cinematic which we've posted above, we think they won't have any problem holding their own.
Until, of course, they start infecting the robot faction. The resulting zombie-robots (or, if you will, "zobots") could pretty much run the board in less than three rounds.