1. Chekov
   Lt. Leslie
2. Lt. Ayala
   James T. Kirk

Chekov first appears in "Amok Time," the Season 2 premiere of the original series. In the Original Timeline, although he is assigned to the USS Enterprise earlier, Ensign Pavel Chekov doesn't show up onscreen until the second season of the original series. The network wanted someone hip to attract younger viewers, so creator Gene Roddenberry came up with the Russian character of Chekov, giving him a mop-top akin to the Beatles and the Monkees.

1. Captain Benjamin Sisko
   Dr. Beverly Crusher
2. Lt. Worf
   Voyager computer

Dr. Beverly Crusher first appears in "Encounter at Farpoint," the series premiere of "The Next Generation." When she was younger, she studied tap and jazz dance in St. Louis, winning several competitions. This earned her the nickname "The Dancing Doctor" at Starfleet Medical School. This performing background leads her to establish a theater troupe aboard the Enterprise, putting on performances of "Cyrano de Bergerac," "The Pirates of Penzance" and "Frame of Mind."

1. Uhura
   Captain Jean-Luc Picard
2. Dr. Julian Bashir
   Miles O'Brien

Picard first appears in "Encounter at Farpoint," the series premiere of "Star Trek: The Next Generation." Captain Jean-Luc Picard wasn't always a captain. He started his career as commander and first officer of the USS Stargazer, assuming the rank after his own captain died in battle. It wasn't until 30 years later that he became the captain of the USS Enterprise-D.

1. Kathryn Janeway
   Sarek
2. Uhura
   Sub-Commander T'Pol

Sarek is Spock's Vulcan father. Sarek's wife was Amanda Grayson, a human teacher.

1. James T. Kirk
   Hikaru Sulu
2. Leonard "Bones" McCoy
   Miles O'Brien

McCoy first appears in "The Man Trap," the series premiere of the original "Star Trek" series. In the Original Timeline, Leonard "Bones" McCoy begins his career on the original USS Enterprise under James T. Kirk as lieutenant commander and chief medical officer. By the time he retires, he is an admiral and has the honor of touring the USS Enterprise-D — at the ripe old age of 137.

1. Lt. Commander Data
   Lt. Malcolm Reed
2. Miles O'Brien
   Odo

Data first appears in "Encounter at Farpoint," the series premiere of "Star Trek: The Next Generation." Data first serves aboard Captain Picard's Enterprise as commander of ops and the second officer with the rank of lieutenant. He is promoted to First Officer 15 years later, aboard the USS Enterprise-E, but sacrifices himself to save his crew and never gets to serve in his new position.

1. Kor
   Wesley Crusher
2. The Doctor
   James Kirk

Wesley Crusher first appears in "Encounter at Farpoint," the series premiere of "The Next Generation." Wesley Crusher is the gifted son of Dr. Beverly Crusher. His fears are lightning storms, Bulgallian rats — and whether or not he would be able to make a life-and-death decision in a no-win situation — as Captain Picard did, which caused the death of Wesley's father.

1. Kor
   Chekov
2. Tom Paris
   Ensign Travis Mayweather

Kor first appears in the original series episode, "Errand of Mercy." Kor is a Klingon Dahar Master and comrade of Koloth and Kang.

1. Seska
   James T. Kirk
2. Lt. Ayala
   Lt. Worf

Lt. Worf first appears in "Encounter at Farpoint," the series premiere of "The Next Generation." Worf was raised by his adoptive human parents after his Klingon parents were killed by Romulans at Khitomer. It was hard for him to reconcile the violent Klingon culture with the nonviolent human culture until he inadvertently broke the neck of an opposing team's soccer player at the age of 13 (he child died). The guilt he carries with him over this keeps his violent tendencies in check.

1. Uhura
   Harry Kim
2. Kor
   Lt. Commander Data

Uhura first appears in "The Man Trap," the series premiere of the original series. The premiere episode was actually the sixth one filmed, and the order was shuffled later. Uhura is fluent in Swahili, and her name means "freedom" in that language.

1. Harry Kim
   Voyager computer
2. Quark
   Seven of Nine

Quark first appears in "Emissary," the series premiere of "Deep Space Nine." Quark had one true love — Natima Lang, a Cardassian journalist. Leaning towards the dissident side herself, she stayed with Quark knowing full well that he was aiding the Bajoran resistance. But she did end things once she discovered that he was using her secret access codes to be paid for fake products.

1. Uhura
   Seven of Nine
2. Admiral Maxwell Forrest
   Miles O'Brien

Miles O'Brien first appears in "Encounter at Farpoint," the series premiere of "The Next Generation." Miles O'Brien discovered his latent mechanical aptitude when his patrol was attacked by Cardassians on Setlik III, and he had under 10 minutes to get a field transporter operational. He did — and saved 13 people as a result.

1. Dr. Julian Bashir
   Counselor Deanna Troi
2. Naomi Wildman
   Dr. Phlox

Counselor Deanna Troi first appears in "Encounter at Farpoint," the series premiere of "Star Trek: The Next Generation." She is the daughter of a Betazoid ambassador and a Starfleet lieutenant. She remembers her father reading Ancient Western bedtime stories to her, then checking under her bed for monsters. He died when she was 7 years old.

1. Kathryn Janeway
   Sarek
2. Lt. Leslie
   Spock

Spock first appears in "The Cage," the first pilot for the first "Star Trek" series. The character of Spock is the link between three iterations of "Star Trek." He is the only character from the first pilot (iteration 1) to be included in the second pilot and original series (iteration 2), and he inadvertently creates the Kelvin Timeline of the J.J. Abrams-started movie series when he and his Romulan pursuers are sucked back in time by a black hole (iteration 3).

1. Chakotay
   Major Kira Nerys
2. Hikaru Sulu
   Lt. Worf

Sulu first appears in "The Man Trap," the series premiere of the original series. In the Original Timeline, Hikaru Sulu begins his career on the USS Enterprise as the staff physicist. He is transferred to the helm after one year of service and later promoted to captain of the USS Excelsior.

1. Harry Kim
   Admiral Maxwell Forrest
2. Koloth
   Lt. Commander Data

Harry Kim first appears in "Caretaker," the series premiere of "Star Trek: Voyager. Harry Kim is operations officer aboard the USS Voyager. A clarinetist in the Juilliard Youth Symphony, he carried his musicianship into adulthood and plays onboard the Voyager with oboist Lt. Susan Nicoletti.

1. Scott
   Captain Benjamin Sisko
2. Captain Kathryn Janeway
   Neelix

Kathryn Janeway first appears in "Caretaker," the series premiere of "Star Trek: Voyager." Kathryn Janeway captains the USS Voyager, Intrepid-class, when it disappears in the Badlands. After she (and the ship) return to Federation space, she is promoted to admiral.

1. Captain Benjamin Sisko
   James T. Kirk
2. Major Kira Nerys
   Chekov

Major Kira Nerys first appears in "Emissary," the series premiere of "Deep Space Nine." After Keiko O'Brien is injured, Dr. Bashir uses a transporter to transplant her fetus into Major Kira Nerys. Kira experiences the typical pregnancy symptoms: muscle spasms, swollen feet ... and sneezing (typical for Bajorans, at least).

1. Lt. Leslie
   Tuvok
2. Harry Kim
   Captain Benjamin Sisko

Although the character Tuvok first appears in "Caretaker," the series premiere of "Star Trek: Voyager," it is not his first appearance in the "Star Trek" universe according to the series' timeline. That would be aboard the USS Excelsior, commanded by Hikaru Sulu, during the Khitomer accords shown in "Star Trek VI." His experiences are shown in "Flashback," a "Voyager" episode from Season 3.

1. Captain Jonathan Archer
   Chekov
2. Lt. Commander Data
   Lt. Malcolm Reed

Captain Jonathan Archer first appears in "Broken Bow," the series premiere of "Enterprise." Captain Jonathan Archer is the son of Henry Archer, the lead developer of the Warp Five engine. Captain Archer commands the first ship to be powered by that engine, the Enterprise NX-01.

1. Lt. Tasha Yar
   Wesley Crusher
2. Major Kira Nerys
   Chakotay

Lt. Tasha Yar first appears in "Encounter at Farpoint," the series premiere of "The Next Generation." Lt. Tasha Yar is the first chief of security aboard Captain Picard's Enterprise. Despite being hardened emotionally by her violent upbringing on the streets of Turkana IV, she is able to be intimate with Data during the events of the Next Generation episode, "The Naked Now."

1. Odo
   Dr. Katherine "Kate" Pulaski
2. Jake Sisko
   Commander William T. Riker

Riker first appears in "Encounter at Farpoint," the series premiere of "Star Trek: The Next Generation." Commander William T. Riker turns down two chances to command his own ship, instead choosing to remain Captain Picard's "Number One." He does, however, accept a field promotion to captain the USS Enterprise-D when Picard is abducted by the Borg.

1. Major Kira Nerys
   Commander Charles "Trip" Tucker III
2. Spock
   Neelix

Neelix first appears in "Caretaker," the series premiere of "Star Trek: Voyager." Neelix is a Talaxian, native to the Delta Quadrant. He serves aboard the USS Voyager as its chef and chief morale officer (self-appointed) in order to help the crew deal with being stranded so far away from home. When the Voyager finds its way back, Neelix opts to stay in his home quadrant, moving to an asteroid where others of his species live.

1. Captain Benjamin Sisko
   Lt. Worf
2. Chakotay
   Commander William T. Riker

Captain Benjamin Sisko first appears in "Emissary," the series premiere of "Star Trek: Deep Space Nine." Captain Benjamin Sisko is a survivor of the Battle of Wolf 359 — a battle between the Federation and the Borg. Although his son, Jake, survived, too, Sisko's wife, Jennifer, did not. Years after her death, Sisko marries Kasidy Yates, a freighter captain.

1. Counselor Deanna Troi
   Admiral Maxwell Forrest
2. Ensign Travis Mayweather
   Quark

Ensign Travis Mayweather first appears in "Broken Bow," the series premiere of "Enterprise." Ensign Travis Mayweather is helmsman of the Enterprise NX-01. Being born in space to parents who lived there makes Mayweather a natural pilot.

1. B'Elanna Torres
   Arne Darvin
2. James T. Kirk
   Commander Charles "Trip" Tucker III

Kirk first appears in "The Man Trap," the series premiere of "Star Trek." In the Original Timeline, it takes James Kirk ten years after graduation to get command of the USS Enterprise. And when his tenure ends after his five-year mission, it is two years before Kirk takes command of the Enterprise back from Will Decker to deal with V'Ger.

1. Dr. Beverly Crusher
   Koloth
2. Wesley Crusher
   Jake Sisko

Koloth is Kirk's Klingon adversary in the original series episode, "The Trouble with Tribbles." He also accompanies his comrades Kang and Kor to Deep Space Nine in their hunt for the Albino in that series' episode, "Blood Oath."

1. Kor
   Lt. Leslie
2. James T. Kirk
   Jake Sisko

Lt. Leslie first appears in "The Man Trap," the original series premiere. He appears in almost 60 episodes of the original series, but only speaks in a few. He is a victim of "red shirt syndrome" in "Obsession" (season 2, episode 13), but shows up alive and well the next week in "Wolf in the Fold."

1. Captain Benjamin Sisko
   Chakotay
2. B'Elanna Torres
   Lt. Leslie

B'Elanna Torres first appears in "Caretaker," the series premiere of "Star Trek: Voyager." Originally part of the Maquis, a group opposed to the borders defined by the Federation-Cardassian agreement, B'Elanna Torres becomes Chief Engineer aboard Captain Janeway's Voyager. She is half-Klingon and half-human, and plays hoverball and Parrises Squares to relax.

1. Lt. Ayala
   Captain Jonathan Archer
2. Lieutenant Worf
   Lt. Malcolm Reed

Lt. Malcolm Reed first appears in "Broken Bow," the series premiere of "Enterprise." Lt. Malcolm Reed continues his family's legacy and serves as the armory officer aboard the Enterprise NX-01. His grandfather was also an officer, but not in Starfleet; he served in Britain's Royal Navy.

1. Odo
   Dr. Phlox
2. Lt. Commander Jadzia Dax
   Uhura

Odo first appears in "Emissary," the series premiere of "Deep Space Nine." Odo is a Changeling, found floating in space all alone. He was brought to Bajor during the Cardassian occupation and educated at the Bajoran Institute for Science for seven years — as a specimen.

1. Jake Sisko
   The Doctor
2. Arne Darvin
   James T. Kirk

The Doctor first appears in "Caretaker," the series premiere of "Star Trek: Voyager." The Doctor is the holographic emergency medical program promoted to chief medical officer after the death of the entire medical staff aboard the USS Voyager. Though the automatic command is changed to let him change his opening line, the Doctor chooses to say the same thing whenever he is activated — the program-standard "please state the nature of the medical emergency."

1. Lt. Ayala
   Scott
2. Dr. Katherine "Kate" Pulaski
   Dr. Julian Bashir

Dr. Katherine "Kate" Pulaski first appears in "The Child", the second season opener of "The Next Generation." She is the chief medical officer of the Enterprise for the year that Dr. Crusher acts as head of Starfleet Medical. She went through three marriages and three divorces in the 12 years after ending her intense relationship with a civilian. The name of that civilian? Kyle Riker, father of William T. Riker — first officer of the Enterprise during her stay.

1. Seven of Nine
   Harry Kim
2. Captain Jean-Luc Picard
   Counselor Deanna Troi

Seven of Nine first appears in "Scorpion: Part 2," the fourth season opener of "Star Trek: Voyager." Seven of Nine is possibly one of the first humans assimilated into the Borg, having joined the collective nine years before Captain Picard first encountered the species. When she is "re-assimilated" into humanity, the Voyager's doctor can't remove every trace of her cyborg existence, leaving 18 percent of her Borg implants.

1. B'Elanna Torres
   Lt. Ayala
2. Quark
   Jake Sisko

Jake Sisko first appears in "Emissary," the series premiere of "Deep Space Nine." Jake Sisko is the son of Captain Benjamin Sisko, commander of Deep Space Nine. They live together while Jake is a child, but Jake later moves out and rooms with his Ferengi friend, Nog.

1. Lt. Leslie
   Naomi Wildman
2. Scott
   Arne Darvin

Naomi Wildman first appears in the fourth season "Star Trek: Voyager" episode, "Nemesis." Naomi Wildman is the first child born aboard the USS Voyager. Due to her Ktarian genes (as opposed to her human genes), she experiences growth at a rapid rate, looking like a 4-year-old when she is only 2.

1. Odo
   Captain Jean-Luc Picard
2. Jake Sisko
   Chakotay

Chakotay first appears in "Caretaker," the series premiere of "Voyager." Captain Hikaru Sulu sponsored Chakotay's admission into Starfleet Academy. Chakotay eventually became an instructor in Starfleet's Advanced Tactical Training. But when his father died fighting the Cardassians for his homeworld, Chakotay joined the Maquis resistance to the Federation-Cardassian border agreement.

1. Jake Sisko
   Lt. Commander Jadzia Dax
2. Dr. Julian Bashir
   Dr. Phlox

Dr. Julian Bashir first appears in "Emissary," the series premiere of "Deep Space Nine." Before starting the path to practicing medicine, Dr. Julian Bashir sought a career as a tennis professional. When he realized he wasn't cutting it, he went to Starfleet Medical School and took up racquetball, leading the school's team to the sector championship. He plays racquetball during his assignment on Deep Space Nine with Chief Miles O'Brien.

1. Commander Charles Tucker III
   Lt. Commander Data
2. Tom Paris
   Tuvok

Commander Charles "Trip" Tucker III first appears in "Broken Bow," the series premiere of "Enterprise." Commander Tucker got his nickname because he was the third Charles Tucker (after his father and grandfather) — "Trip" is short for "triple." He enjoys deep-sea diving, constructing starships in orbit and interspecies dating.

1. Quark
   Captain Jonathan Archer
2. Scott
   The Doctor

The character of Chief Engineer Montgomery "Scotty" Scott didn't appear on-screen until the third episode of the original series, "Where No Man Has Gone Before." Only his voice "appears" in the series premiere.