1. They talk too much.
   They eat too much.
2. They reproduce too quickly.
   They don't like Klingons.

Tribbles are small, furry, ball-like creatures that make a high-pitched purring noise. According to Spock, tribbles “do have one redeeming characteristic … They do not talk too much.”

1. Harcourt Fenton Mudd
   Khan Noonien Singh
2. Gary Seven
   Klingon Commander Koloth

This character returned to threaten the galaxy’s safety in both "Star Trek II" (1982) and "Star Trek Into Darkness" (2013). Khan Noonien Singh was the genetic “superman” who fled Earth in a “sleeper ship,” only to be awakened in the 23rd century. Ricardo Montalban played Khan in the original series episode “Space Seed.” Benedict Cumberbatch played him in "Star Trek Into Darkness."

1. Romulans
   Klingons
2. Organians
   Talosians

The Romulans were a Vulcanoid species that rejected peace and logic in favor of aggression and conquest. They only appeared in two episodes of the original series (“Balance of Terror” and “The Enterprise Incident”) but became a major Federation adversary in "Star Trek: The Next Generation."

1. Calgary
   Mojave
2. Iowa
   Colorado

As Kirk tells Dr. Gillian Taylor in "Star Trek IV: The Voyage Home" (1984), “I’m from Iowa — I only work in outer space.” In "Star Trek" (2009), the Enterprise is seen being built in Iowa, closely linking the captain and his vessel.

1. Jane Wyman
   Elizabeth Taylor
2. June Tyler
   Joan Collins

Joan Collins made her mark playing the scheming, self-centered Alexis Carrington on the 1980s primetime soap opera "Dynasty." Scriptwriter Harlan Ellison modeled Edith Keeler after 1930s evangelist Aimee Semple McPherson.

1. Chekov
   Sulu
2. Uhura
   Scotty

Chekov debuted in “Catspaw,” complete with a (quickly discarded) Monkees-style wig. Gene Roddenberry claimed he also created Chekov as a tribute to Russia’s pioneering space achievements.

1. Sagan
   Galileo
2. Newton
   Einstein

The Galileo figured in several episodes, as did a Galileo II. The animated "Star Trek" showed viewers a shuttle named after another famous astronomer, the Copernicus.

1. The Three Musketeers
   The Adventures of Robin Hood
2. Ivanhoe
   Knights of the Round Table

His inhibitions erased by a virus, Sulu runs amok in the Enterprise’s corridors with a fencing foil, shouting “Richelieu, beware!” — a reference to "The Three Musketeers" (as is Spock’s reference to Sulu as “d’Artagnan”).

1. Lancelot and Guenevere
   Luke and Laura
2. George and Gracie
   Bogie and Bacall

The whales were named after legendary husband-and-wife comedy team of George Burns and Gracie Allen.

1. USS Excelsior
   USS Excalibur
2. USS Challenger
   USS Executor

Sulu commanded the Excelsior. His promotion was mentioned in a scene filmed for but cut from "Star Trek II: The Wrath of Khan" (1982). The Excelsior was first seen, under a different captain, in "Star Trek III: The Search for Spock" (1984).

1. Penda
   Maya
2. Nyota
   Kadhira

Uhura’s first name was officially established as Nyota in the 2009 movie, but many fans had long accepted it as a fact. The name means “star” in Swahili.

1. Gary Seven
   Klingon commander Kor
2. Harry Mudd
   Miranda Jones

Veteran character actor Roger C. Carmel played cosmic con man Harry Mudd in two live-action epsiodes — “Mudd’s Women,” in which he ran a “mail order bride” business and “I, Mudd,” in which he ruled a planet of robots — and the animated "Star Trek" episode “Mudd’s Passion.”

1. William Shatner
   Gregory Peck
2. Jeffrey Hunter
   Michael York

Jeffrey Hunter played Captain Christopher Pike in “The Cage,” the first of Star Trek’s eventual two pilot episodes. NBC thought “The Cage” was too intellectual for a mass audience, but thought the series showed enough potential to give it a second chance.

1. T’Lar
   Sarah
2. Maho
   T’Pring

T’Pring was Spock’s betrothed. They were telepathically bound to each other as children, per Vulcan custom. She broke their “engagement” by challenging Spock to fight Kirk to the death for her.

1. The Iotians will disassemble it and learn the secrets of the Federation’s technology.
   The Iotians can now contact McCoy whenever they wish.
2. The communicator’s radiation emissions are harmful to Iotians.
   It doesn't pose a problem.

When the Iotians disassemble the communicator, they will discover the transtator, which Spock says is “the basis for every important piece of equipment that we have.”

1. To stay close to Mr. Spock, from whom she was seeking revenge
   To practice medicine alongside her former teacher, Dr. McCoy
2. To find her missing fiancé, Dr. Roger Korby
   To escape certain death on the failed colony Tarsus IV

The first-season episode “What Are Little Girls Made Of?” (written by legendary horror writer Robert Bloch, author of "Psycho"), established Chapel’s engagement to Roger Korby — who had transferred his consciousness to an android body by the time the Enterprise found him.

1. He is killed during an undercover mission on the Romulan home world.
   He is stabbed by a Klingon soldier on the Genesis Planet.
2. He contracts xenopolycythemia, a rare space sickness with no known cure.
   He dies from prolonged exposure to protomatter, a dangerously unstable substance.

David takes the knife a Klingon soldier intended for Saavik. William Shatner created the emotional moment when Kirk, hearing the news, stumbles and falls to the bridge floor, shouting, “You Klingon bastards, you killed my son!”

1. Robert April
   Jackson Roykirk
2. Richard Daystrom
   Zefram Cochrane

Zefram Cochrane is one of the few "Star Trek" characters played by multiple actors: Glenn Corbett in “Metamorphosis” and James Cromwell in "Star Trek: First Contact" (1996).

1. He died when the Romulans attacked a Federation outpost along the Neutral Zone.
   He acquired godlike powers at the edge of the galaxy, and Kirk had to kill him.
2. He sacrificed himself to stop a relentless planet-killing machine.
   He went insane when exposed to the neural neutralizer at the Tantalus Colony.

Gary Mitchell mutated into a supremely powerful and malevolent being when exposed to strange energies at the galaxy’s edge. He was played by Gary Lockwood, who also played ill-fated astronaut Frank Poole in "2001: A Space Odyssey" (1968).

1. Abraham Lincoln
   The Greek god Apollo
2. Leonardo da Vinci
   Mozart

Although they never met Mozart, the Enterprise crew did (in “Requiem for Methuselah”) meet a long-lived alien who claimed he had been classical composer Johannes Brahms, among other notables.

1. Kal-toh
   Parrises squares
2. Poker
   Three-dimensional chess

While all these games appear in various "Star Trek" series, only three-dimensional chess was a mainstay aboard the original Enterprise. In 1994, the Franklin Mint produced a wildly popular replica of the chess set.

1. Captain Kirk
   Mr. Spock
2. Dr. McCoy
   Mr. Sulu

NBC told series creator Gene Roddenberry to drop either Spock or Number One, the Enterprise’s female second-in-command, from Star Trek’s format. Convinced that a regular alien character was critical to the show’s integrity, Roddenberry kept Spock.

1. Murdering a nightclub dancer
   Disconnecting the USS Excelsior’s transwarp drive
2. Beaming innumerable tribbles aboard a Klingon ship
   Starting a barroom brawl aboard Space Station K-7

Things look bad when Scotty is found standing over a dead woman’s body with a bloody knife, but he is exonerated: He was possessed by the “Redjac,” the same alien consciousness responsible for the “Jack the Ripper” murders in Victorian England.

1. He won command from Commodore April in a friendly card game.
   He assassinated Captain Pike and assumed command.
2. He killed his rivals with an alien weapon, the Tantalus Field.
   He stole the Enterprise from Starfleet.

Officers in the Mirror Universe rise through the ranks by murdering their superiors. In “Mirror, Mirror,” Spock said the evil counterparts of the Enterprise crew were “brutal, savage, unprincipled, uncivilized, treacherous — in every way, splendid examples of homo sapiens, the very flower of humanity.”

1. Assignment: Earth
   Return to Tomorrow
2. Tomorrow is Yesterday
   All Our Yesterdays

“Assignment: Earth” would have followed Gary Seven (Robert Lansing), Roberta Lincoln (Terri Garr) and the shape-shifting black cat Isis as they worked to guide humanity out of its nuclear age into a better future. “Assignment: Earth” is the only episode of the original series set entirely in Star Trek’s past (the year 1968).

1. USS Roosevelt
   USS Kelvin
2. USS Kennedy
   USS Obama

George Kirk served, and perished, aboard the Kelvin. Abrams has included “Kelvin” (his maternal grandfather’s last name) in many projects, including a reference to “Kelvin Ridge” in "Star Wars: The Force Awakens" (2015).

1. Willful interference in the normal development of a pre-warp civilization
   Fomenting mutiny aboard a starship
2. Willfully crossing the Romulan Neutral Zone
   Visiting the mysterious planet Talos IV

Starfleet General Order Seven prohibits all contact with Talos IV. The Talosians’ extreme powers of telepathy and illusion are a danger to human life.

1. Beyond the Rim of the Starlight
   Beyond Antares
2. The Moon’s a Window to Heaven
   Maiden Wine

Uhura sang “Beyond Antares.” The episode marked the second time Nichelle Nichols sang as Uhura — and the last, until “The Moon’s a Window to Heaven” in "Star Trek V: The Final Frontier" (1989).

1. Dr. Richard Daystrom
   Dr. Renee Selar
2. Dr. M’Benga
   Dr. Clark Terrell

Dr. M’Benga, played by Booker Bradshaw, was a human doctor who specialized in Vulcan medicine. He appears in “A Private Little War” and “That Which Survives.”

1. Dr. McCoy
   Mr. Scott
2. Ambassador Sarek
   Ambassador Spock

Although his character was only called “The Admiral” onscreen, DeForest Kelley appeared in “Encounter at Farpoint,” The Next Generation’s pilot episode, as an elderly Leonard McCoy, telling Data the new starship Enterprise “had the right name… Treat her like a lady, and she’ll always bring you home.”

1. Lieutenant Ilia, the bald, highly sexual Deltan navigator
   Lieutenant M’Ress, a bipedal, cat-like alien communications officer
2. Lieutenant Saavik, a half-Vulcan, half-Romulan science officer
   Lieutenant Xon, a Vulcan science officer interested in exploring human emotions

Xon was a character created to replace Spock, and David Gautreaux was cast in the part. When Phase II became "Star Trek: The Motion Picture" (1979) instead, Gautreaux played the smaller role of Commander Branch aboard the ill-fated Epsilon IX space station.

1. He is under the influence of spores from alien plant life.
   He is deliberately conducting a ruse to deceive a Romulan commander.
2. He has traveled back in time 5,000 years and reverted to ancestral ways.
   He is mind-linked with an alien simulation of Genghis Khan.

Lost in the past, Spock began to act like Vulcans of the past. Mariette Hartley played his love interest, Zarabeth. In two of her "Star Trek" novels, A.C. Crispin posited that Spock and Zarabeth had a son.

1. Fal-tor-pan
   Kolinahr
2. Koon-ut-kal-if-fee
   Kahs-wan

The fal-tor-pan, the “refusion,” returns Spock’s consciousness to Spock’s body. Director Leonard Nimoy cast veteran British actress Dame Judith Anderson as the Vulcan priestess who performs the ritual in order to evoke the dignity of Celia Lovsky, who played Vulcan matriarch T’Pau in the episode “Amok Time.”

1. A bricklayer
   An escalator
2. A coal miner
   A cattle rancher

McCoy never claimed to be a rancher. He uttered his more famous catchphrase — “He’s dead, Jim,” or some variation — about 20 times during the original series.

1. Tranya
   Saurian brandy
2. Romulan ale
   Raktajino

The original series featured Saurian brandy in several episodes, "Star Trek II" (1982) introduced Romulan ale, and "Star Trek: The Next Generation" established that raktajino was Klingon coffee, but Balok served tranya to his guests.

1. The Horta
   Dr. Simon Van Gelder
2. Mr. Sulu
   The robot probe Nomad

Spock first joined minds with Dr. Van Gelder (“Dagger of the Mind”). Leonard Nimoy and the writers created the technique as an interesting way to deliver otherwise dry but necessary exposition.