Leonard Nimoy's Spock in particular was changed quite drastically in pre-production. While he's known to Trekkies as a human-Vulcan hybrid, that wasn't the original idea that Gene Roddenberry had for the Enterprise's First Officer.

Okay, remember last recap when I noted the premiere suggested a season that would balance light and darkness? I take it back. “The Griffin Incident” is pretty much all darkness. That’s not necessarily a bad thing, but what begins as a story in which ...