Boris
Where to find: I haven't the slightest clue how to get Boris. It has something to do with Ridley being killed.
All that I know is he replaces Ridley at a certain point if Ridley was killed. I don't recommend trying to kill of Ridley until I find out how to get Boris.
Boris is Ridley's son. He's no doubt go some big shoes to fill, his dad being one of the best Generals you've got.
