10 More Movie Storylines Actors REFUSED To Do

10. Leonard Nimoy And DeForest Kelly Wouldn't Go Evil - Star Trek V: The Final Frontier

While making the original Star Trek series, William Shatner had a clause entitling him to the same terms as his co-star, Leonard Nimoy. Since Nimoy directed the third and fourth Star Trek features, Shatner was allowed to helm the follow-up. 

Though Shatner is a great actor, Star Trek V: The Final Frontier suggested that filmmaking may not be his forte. The sequel is let down by a non-sensical story involving Spock's half-brother, Sybok (who Spock never mentioned) taking over the Starship Enterprise so he can find God. Even though Star Trek regularly explored philosophical quandaries, this was going overboard.

However, it nearly went further. In an earlier script, Sybok's argument was so compelling, it urged Spock and McCoy to join forces with the renegade Vulcan. 

Leonard Nimoy and DeForest Kelly shut this idea down immediately, stating their characters would never willingly turn against their captain. Considering Spock's dying words to Kirk in The Wrath of Khan were, "I have been and always will be your friend," such a betrayal would be completely out of character.

Looking back, it's obvious Nimoy and Kelly's decision was the right one. Having said that, it would've been nice if the actors rejected other plot points, considering how badly The Final Frontier turned out.