For characters who debuted in Star Trek: The Original Series, see Characters.Star Trek The Original Series
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Played by: Laurence LuckinbillSpock's half-brother, an emotional Vulcan on a quest to find God.
- Anti-Villain: Type I and low-end Type III. He's not really a bad guy at all, just misguided and taking things too far.
- Have You Seen My God?: He is convinced that God lives in the centre of the galaxy. The expanded universe says that the evil entity that actually does live there somehow contacted and tricked him into believing this in order to escape, making Sybok an Unwitting Pawn.
- Heroic Sacrifice: Sacrifices himself to fight the entity and buy the crew time to escape.
- Long-Lost Relative: He is Spock's half-brother.
- Morally Questionable Plan: Steal a star ship and use to reach the Shakari at center of the galaxy and meet God.
- My God, What Have I Done?: Once he realizes he isn't dealing with God and has put everyone in danger, he immediately helps out.
- Single-Issue Psychology: He helps people by using his psychic powers to make them confront their "one pain", leaving them feeling much better and usually converting them to his side. Subverted with the evil entity, which is clearly hurt and frustrated when he pulls this trick on him, but recovers and still remains evil.
- Psychic Powers: He is able to telepathically force people to confront their own deep-rooted traumas.
- Technical Pacifist: He dislikes killing and violence- and it must be said, in the end he doesn't kill anyone- but is ready to resort to hijacking, kidnapping and maybe-or-not-quite brainwashing (probably closer to More Than Mind Control) in order to fulfil his objective, and even then only because he thinks he is on a Mission from God.
- Well-Intentioned Extremist: While his actions are questionable to say the least, he honestly didn't want anyone to get hurt or killed during the mission. The second his "God" started harming his brother and friends, he decided to turn against him.
Played by: Todd BryantA brash young Klingon captain who is bored of his usual hobby of blowing up bits of space debris, and so decides that the best way to become famous quickly is to engage Kirk in battle and defeat him.
- Demoted to Extra: A more literal example than most; he pops up again in the next film, apparently having been busted down to a court translator. That film doesn't confirm either way whether it's meant to be Klaa, but novels and other materials confirmed that it was.
- Didn't Think This Through: In his zeal to attack Kirk, he either didn't realize or just flat-out ignored the fact that his orders were only to rescue Koord, not pick fights with the Federation. Eventually, Koord himself removes him from command over this.
- Expy: He's effectively a younger, more impetuous version of Kruge from Star Trek III: The Search for Spock.
- Worthy Adversary: The entire reason why he goes after Kirk.
Played by: George MurdockAn entity sealed in the center of the galaxy claiming to be God.
- God Is Evil: Though most likely a subversion since its probably not actually God but just another Sufficiently Advanced Alien.
- Sealed Evil in a Can: He claimed to have been imprisoned on the planet in the center of the galaxy and wanted to "join" with the Enterprise so he could escape.
- Hoist by His Own Petard: If he hadn't claimed to be God / been a Jerkass to Kirk / give away his Evil Plan to merge with the ship, he might well have managed to escape.
- God Guise: Plays along with Sybok's delusions that he is in fact God.
- Sufficiently Advanced Alien: Implied in the movie and canon in the expanded universe, where its said that the whole God Guise thing was its modus operandi even before it was imprisoned.
Admiral Robert Bennett
Played by: Harve BennettThe officer who assigns the Enterprise-A to rescue Sybok's hostages on Nimbus III.
- Creator Cameo: Played by Harve Bennett, who produced and co-wrote the second through fifth films.
- First-Name Basis: He's only referred to as "Bob" on-screen, with his full name coming from supplementary materials.
- Obstructive Bureaucrat: In the sense that his poorly thought-out orders end up making the entire plot of the film possible, instead of the hostage situation being immediately resolved by a ship with working transporters. Surprisingly enough, it's inverted in the few novel appearances that he's made, where he's actually shown to be a Reasonable Authority Figure.
- Skewed Priorities: He insists on sending the Enterprise-A to rescue the ambassadors despite suffering major systems malfunctions and being under-crewed, on the grounds that Kirk is the best captain to handle the job. Even accepting the fanon theory that Kirk couldn't take the Excelsior because its transwarp drive didn't work, any other ship would have been able to just fly over to Nimbus III and beam the hostages out of danger.