I just got a great idea, make Gordon travel the world to get to Borealis, make him go through Argentina so Frank will be able to voice a guy there, or maybe also make him pass through Israel and I'll voice someone there xD
And in the end he will reach Borealis and do whatever he needs to do there.
By doing that you can make different kind of monsters, NPC's, cities, vehicles, etc. though most probably it will take lots of time =\