I started a rewatch on my own last month ... here was my entry on this ep. (http://nonotthatone.livejournal.com/15605.html)

In rewatching, the thing that makes me saddest about this ep is the foreshadowing of the consequences of turning your back on a friend. Pete and Clark were friends with Greg but then ... an inexplicable rift, something they couldn't pinpoint or describe, but now Greg is evil and there's no turning back.