This is by far the best McKay episode I have ever seen. His character has gone so far from the snivling coward of the first season. To me the most powerful scene was the shot of McKay's hands after he had let Keller down into the tunnel. They were so scratched up and bleeding, and still he lowered Carter down. I feel sure that in season one he would not have even considered doing something like that. He was willing to sacrifice himself for others, and this is a great example of how Hewlett's character has evolved over the years.
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