Comments by "Joe R M" (@joermnyc) on "Top 10 WORST Recastings in Movie Sequels" video.

  1. Star Trek III: Robin Curtis replacing Kirstie Ally as Lt. Savvik. They also changed her character to make her 100% Vulcan, while the Star Trek II novelization said she was half-Romulan, hence her more emotional moments. (She also briefly appears in Star Trek IV, and again the novelization mentions she is pregnant with Spock's kid... but that's never brought up again.)
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  2.  @djhutchison  right, but having Savvik betray Spock and Kirk would have been devastating.
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