10. 'Star Trek III: The Search for Spock'
The creative team behind Star Trek faced a bit of a dilemma after the unexpectedly huge success of Star Trek II: The Wrath of Khan. The series was hotter than ever with big demand for a sequel, but they'd just killed off Spock. Lucky for them, his casket landed on the mysterious Genesis planet where life grows at an insane rate. That made it easy to bring back the character, and Leonard Nimoy was willing to reprise it when they let him direct the movie. Unfortunately, the movie is a bit of a muddled mess. Christopher Lloyd's evil Klingon character seemed weak after Khan, and watching Spock evolve from an infant into a full-grown Vulcan was pretty lame. They also couldn't get Kirstie Alley to reprise her character of Saavik, so a new actress was brought in. Alley was right to sit this one out. It's really just a placeholder between the brilliance of The Wrath of Khan and the fun of The Voyage Home.