[Spock’s dying words, repeated from the previous film]
Capt. Spock: Don’t grieve, Admiral. It is logical. The needs of the many outweigh…
Kirk: …the needs of the few.
Capt. Spock: Or the one. I have been and always shall be your friend. Live long and prosper.
Spock died (in Star Trek II: The Wrath of Khan). We cried- hey, it was really emotional. Then we learned that Spock could be alive- whoa! In the opening credits, there is an extra long pause between Shatner and Kelley’s names, where Nimoy’s name would normally be. Nimoy takes on the role of director; Nicholas Meyer (who directed the previous 2 films) refused b/c he thought that Spock’s death should’ve remained final. (Meyer would return to direct Star Trek IV: The Voyage Home and Star Trek VI: The Undiscovered Country).
[their first look at the USS Excelsior]
Uhura: Would you look at that.
Kirk: My friends, the great experiment: The Excelsior. Ready for trial runs.
Sulu: She’s supposed to have transwarp drive.
Scotty: Aye. And if my grandmother had wheels, she’d be a wagon.
Kirk: Come, come, Mr. Scott. Young minds, fresh ideas. Be tolerant.
Admiral Kirk (William Shatner) and the Enterprise crew return to Earth for some essential repairs to their ship. When they arrive at space dock, they’re shocked to discover that the Enterprise is to be decommissioned. Dr. McCoy (DeForrest Kelley) begins acting strangely. Scotty (James Doohan) is re-assigned to another ship. Suddenly, Ambassador Sarek (Mark Lenard) comes to visit Kirk to see if he holds Spock’s spirit (katra). Once Kirk realizes that McCoy hold the katra, he decides to steal back the Enterprise and travel to the Genesis planet to retrieve the body of Spock. The body must be taken to Mt. Seleyah on Vulcan so it can be joined w/ its katra. Meanwhile, some Klingons are planning to steal the secrets of the Genesis device for their own deadly purpose!
Kirk: You’re suffering from a Vulcan mind-meld, doctor.
McCoy: That green-blooded son of a bitch! It’s his revenge for all the arguments he lost.
The film’s villains were intended to be Romulans, but the studio wanted Klingons to be used (as they were better-known aliens). The Romulan warship was already built and they didn’t want the expense of replacing it. Since TOS had established that Klingons and Romulans had shared tech/ships (for real-world cost-cutting reasons), the idea of Klingons using a Romulan warbird wasn’t a problem. Edward James Olmos was Nimoy’s first choice for the role of Kruge; producer Harve Bennett preferred Christopher Lloyd. Nimoy cast Lloyd b/c he came across as more operatic and physically intimidating. Of course, this could be funny to those who know Lloyd as Doc Brown in the Back to the Future movies. We also see John Larroquette as Maltz, the quiet/thoughtful Klingon.
Kruge: I’ve come a long way for the power of Genesis, and what do I find? A weakling human, a Vulcan boy, and a woman!
Saavik: My lord, we are survivors of a doomed expedition. This planet will destroy itself in hours. The Genesis experiment is a failure.
Kruge: A failure? The most destructive force ever created? You will tell me the secret of the Genesis torpedo.
Saavik: I have no knowledge.
Kruge: Then I hope pain’s something you enjoy.
Production was endangered by the large fire at Paramount Studios. Shatner helped fight the fire and rescue a crew member before firefighters arrived- wow! Shatner said he was concerned re: staying on schedule, as he also had to shoot his TV show- T.J. Hooker. The quiet (yet powerful) scene in where Kirk stumbles back into his captain’s chair after hearing of the death of David was an improvisation by the actor. Shatner was told by Nimoy to do whatever reaction he wanted to do. It’s too bad that Kirk (and we) didn’t get to know David much.
[Kirk and party have commandeered Kruge’s Bird-of-Prey]
Kirk: [to Maltz] You! Help us or die!
Maltz: I do not deserve to live!
Kirk: Fine, I’ll kill you later!
[later, once safely in warp speed]
Kirk: Take care of the prisoner.
Maltz: Wait! You said you would kill me!
Kirk: I lied!
There are some light/humorous scenes in this movie. We learn that Scotty always exaggerated how long it’d take to repair something on the ship. And who didn’t laugh when McCoy tried to do the Vulcan nerve pinch at the alien bar? Scotty told off the talking transporter on the Excelsior. Sulu (George Takei) gets to beat up a (big) security guy. Uhura (Nichelle Nichols) pulled a phaser on the young lieutenant who’d made ageist comments (Mr. Adventure), then she transported her crewmates away.
Sarek: Kirk, I thank you. What you have done is…
Kirk: What I have done, I had to do.
Sarek: But at what cost? Your ship. Your son.
Kirk: If I hadn’t tried, the cost would have been my soul.
The dramatic finale on Vulcan really makes this movie! Judith Anderson was 87 y.o. when she appeared as the Vulcan High Priestess; she was encouraged to take this role by her nephew (who was a big fan of TOS). The scenes on the Genesis Planet were shot on the same soundstages used by Cecil B. DeMille in The Ten Commandments (1956); Anderson played the slave who knew the secret re: Moses’ heritage.
 Leonard Nimoy takes the director’s helm and while he does a competent job it is somewhat workmanlike and his experience in TV and not-so-much-experience in feature films shows, loved the focus on the characters and their relationships but it could have been more expansive.
The music by James Horner… It is bombastic and rousing at times but also swelling in romance and sensitivity and beautiful orchestration, the heavy representation of the percussive and dissonant theme for the Klingons was also effective.
‘The Search for Spock’ does have an intelligent script that develops the characters very well indeed…
 It seems a lot of people are split on Lloyd but I thought he was pretty good here. I liked seeing him under all the make-up and thought he did a good job even if the role itself wasn’t the greatest. The special effects here are certainly a step up from the previous movie and I’d also say that battle sequences are much better directed.
 …I put “The Search for Spock” on a par with my favorite episode of the original Star Trek TV series. That would be ‘Amok Time’ which examined Vulcan rituals and customs, and interestingly, pitted Spock (Leonard Nimoy) against his captain and best friend, James T. Kirk (William Shatner) in a battle to the death. The return to Spock’s home planet in this film was a cool way to bring the story back around to his Vulcan roots and add to the mythology of Star Trek by introducing such concepts as the Fal-tor-pan (the refusion of Vulcan legend), and the soul essence of Vulcans called the ‘katra’.
The battle of wits between Kirk and Kruge brought to mind another favorite TV episode, ‘The Corbomite Maneuver’, a story in which Captain Kirk seemingly made up all that business about a destruct sequence to thwart an overpowering enemy. Apparently it was a good enough idea to incorporate into Star Trek lore as a legitimate way of dealing with an enemy who got the upper hand.
-Excerpts from IMDB comments