Haha, no, I literally haven't a clue beyond the stuff I was actually in. Even then, we'd only get given a veeeery brief idea of whatever it was that was being shot to help set a mood or general behaviour.
It's actually funny how similar the casting process (in any big production) is in that sense to perhaps the actual logistics of the story. I was a Borg soldier. I literally had no idea what was happening in any of the other character's story arcs until they literally crossed paths with Jarl Borg.
Another effect of this was that the battle scenes were really a case of 'us versus them'. The Borg extras could only easily talk to, and make friends with, other Borg extras. When battling Horik and Ragnar's army in the first episode, it was the first time we would meet those actors and extras. Sure there was an inherent niceness to everyone but the people you could talk to the easiest were the ones on your side of the battle.
That and not knowing really who/where/why we were fighting until the fact felt like some sort of conscription or something haha.
I don't think I've crossed any lines here. Seems pretty par for the course for handling consistency and management of extras. But it was funny to be in the situation to think about it.
Now what will I watch on Saturday mornings? I DVR it and watch it then. 
