One of the interesting things about the cinematic Star Trek universe is that it’s considered all the even-numbered movies are good movies, and all the odd-numbered movies are considered shockers. Star Trek: The Motion Picture (1979) was deemed a bore, Star Trek III: The Search for Spock (1984) so-so (although, as I wrote, I think this movie is under-appreciated), and Star Trek V: The Final Frontier (1989) a mess. But Star Trek II: The Wrath of Khan (1982) is still considered unparalled for Trek and science-fiction movies, and Star Trek IV: The Voyage Home (1986) was the biggest grossing Trek movie to that time. So what did the sixth installment…