Kruge. A great villain in my favorite Star Trek movie of all time. I love the spin he puts on his lines.
A lot of people blow this off but I believe and will always maintain that Lloyd's roles as Reverand Jim and Doc Brown made it harder for some people to take him seriously as such a bad guy.
Taxi and Back to the Future were right around the same time as TSFS
TSFS came out in 1984. Back to the Future hit theaters the following year, so Doc Brown was not figuring in anyone's mind at that point. Maybe afterward on home video, but not at the time.
I can agree about Reverend Jim, even though I wasn't a fan of Taxi and never watched it until well after I saw Star Trek III.
I know BTTF came out after TSFS, but there are a lot of people who saw BTTF first and TSFS later on VHS or something and went "Hey!!!! That's loveable Doc Brown...he can't be this ruthless bad guy"
And I believe there are also people who saw TSFS first but because BTTF came out shortly after they "retconned" Kruge in their minds as Doc playing a Klingon and couldn't take him as seriously as a bad guy because Doc was so loveable.
Like I said Chris Plummer had 25 years between Captain von Trapp and Chang. I think only die hard TSOM fans would have a problem with the leader of the Von Trapps being such an evil jerk. Playing the "what if" game if TUC comes out shortly after or even before "Music" I think a lot of people wouldn't want to accept Plummer in the role of Chang.