Season two finale
Wading in a pool of irradiated terra-portal will do that to you.
He ‘met’ him in season one to start with. Scanned his thoughts or Looked into his soul; whichever you prefer)
Um, by letting them watch the whole thing. Without year gaps to forget everything.
Also Locke was shouting (words) in the night. That’s different
Karl was the worst
Mikhail and Eco should’ve lived. Potential was Lost there
Yes, they actually do
Michail was an interesting character. A typical Russian intelligent and reliable. Sadly he fell a victim to the monster that is Stereotype and ended up being no more than a lunatic soldier with a gruff accent and a grenade.