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Pavel Chekov, son of Andrei Chekov, was born in 2241. Originating from Russia, he spoke with a heavy Eastern European accent, which caused him difficulty when speaking to Starfleet computer systems; his authorization code aboard the Enterprise – "9-5-Victor-Victor-2" – was particularly difficult for him to pronounce.
Starfleet career Edit
Stopping Nero Edit
In 2258, Chekov was the navigator assigned to the Enterprise during her impromptu maiden voyage - an emergency mission to protect the planet Vulcan from attack by the time travelling war criminal, Nero.
Departing Earth's Starbase 1, Captain Christopher Pike addressed Chekov as "Russian whiz-kid", ordering the ensign to use the comm to brief the Enterprise crew on the task at hand. As the Enterprise confronted Nero, Chekov used his superior mathematical skills to calculate the coordinates for beaming faster than the computer - allowing him to personally transport James T. Kirk and Hikaru Sulu back aboard the Enterprise before they fell into the singularity created on Vulcan by Nero.
Remaining in the transporter room, Chekov also transported Spock, Sarek and the surviving members of the Vulcan High Council from the surface of Vulcan. He was, however, unable to save Spock's mother, Amanda Grayson, before she fell to her death.
After the destruction of Vulcan, Chekov devised a way to beam Kirk and Commander Spock to the Narada, without Nero knowing the Enterprise was in proximity to his ship. Chekov's plan required the Enterprise to drop out of warp] near Titan, one of Saturn's moons, which hid the obscured the ship from the Romulans' sensors, allowing Kirk and Spock to successfully beam over undetected. Chekov's plan was ultimately instrumental in saving Earth.
After the defeat of Nero, Chekov served again as navigator under newly promoted Captain James T. Kirk and left with the crew to explore space. (Star Trek)
Acting chief engineer Edit
Shortly after the Nibiru mission, Chekov was temporarily promoted to chief engineering officer after the departure of Montgomery Scott. Upon learning of his promotion, Chekov expressed apprehension about donning a red shirt.
Before the Enterprise could reach its destination of Qo'noS, Chekov discovered a coolant leak in the warp core and was forced to drop the ship out of warp manually. Assured by Kirk that the coolant leak was likely the result of sabotage, Chekov succeeded in the repairing the warp drive, allowing the Enterprise to avoid an initial attack by Section 31's USS Vengeance. The Vengeance, however, was able to catch up to the Enterprise and quickly crippled the ship, sending it into Earth's gravitational pull.
Catching a dangling Kirk and Scott before they plummeted to their deaths aboard the foundering Enterprise, Chekov reestablished the ship's power systems before it crashed into the surface, then retook his post on the bridge to aid in the hunt for and eventual capture of John Harrison.
The five-year mission Edit
Almost a year later, Chekov attended a memorial service for those who died and resumed his role as navigator on the repaired Enterprise when it embarked on the first five-year mission. (Star Trek Into Darkness)
- 2241: Born to Andrei Chekov.
- appointed acting chief engineer of USS Enterprise.
- sets out on five-year mission as navigator of USS Enterprise.
- appointed navigator of the USS Enterprise-A
"Russian wizkid, what's your name? Chanko? Cherpov?"
"Ensign Chekov, Pavel Andreievich, sir."
"Fine, Chekov, Pavel Andreievich, begin ship-wide mission broadcast."
"Yes, sir. Happy to."
- - Christopher Pike and Pavel Chekov. (Star Trek)
"Ensign authorization code Nine-Five-Wictor-Wictor-Two."
"Authorization not recognized."
"Ensign authorization code Nine-Five... Victor... Victor-Two."
- - Pavel Chekov, accessing the ship's all-call system and the Enterprise computer. (Star Trek)
"Move, move, move, move, move! I can do that! I can do that! Move, move, move, move!"
- - Pavel Chekov, while running to the transporter controls to save a freefalling Kirk and Sulu. (Star Trek)
"Ё моё!" (Russian exclamatory expression pronounced "Yo moyo!", meaning "Oh man!" )
- - Pavel Chekov, after successfully transporting a plummeting Kirk and Sulu from Vulcan's atmosphere. (Star Trek)
Background information Edit
Chekov was played by Anton Yelchin.
Anton Yelchin was unsure precisely why he was cast in the role of Chekov, though he figured it had to do with his young age and the fact that he was "familiar with Russian people. Very, very familiar." (His parents are Russian.)  During his audition, Yelchin had to try out his Russian accent, which included saying Chekov Prime's famous line from Star Trek IV: The Voyage Home: "nuclear wessel".  When he took the role of Chekov, Yelchin signed on to reprise the character in a total of three Star Trek films. 
Yelchin prepared to play Chekov in the films Star Trek, Star Trek Into Darkness and Star Trek Beyond by consulting Star Trek: The Original Series, paying close attention to the portrayal of the prime version of the character therein. "I try and embrace that energy every time, and be respectful of that [....] It's a little different from how I approach other characters," Yelchin noted. Although he personally preferred the first and second seasons of the series, he based his performance of Chekov mainly on TOS Season 3 due to how much it emphasized the character of Chekov Prime. (Star Trek Magazine Movie Special 2016, pp. 84 & 86)
Despite appearing as Chekov in as many as three films, Anton Yelchin remained passionate about the role. "The character is so much fun to play, so I'm always game for it," commented Yelchin, shortly after completing his work on Star Trek Beyond. "It's interesting, because I've never had the experience of making three films in a row with the same people, and, most importantly, the same character, before. I grow as I learn. How I look at my work has changed. Every time, I get to apply these new ideas to the same character. That's the thing that excites me the most [....] Inevitably, I start drawing from other sources that I wasn't aware of when I was younger. I've been very fortunate to be playing this character, this joyous, fun role [....] I've developed a different way to look at work, and what I was trying to accomplish [when first playing Chekov]. The more my perspective on the actual process changes, the more different ways I look at my own work. Even this time versus last time, I viewed things another way, and borrowed from different things. That being said, I always try and accomplish a similar character. You can see what you've learned about yourself every time you go to work. It's kind of odd, but I like it." (Star Trek Magazine Movie Special 2016, pp. 84 & 87)
Remaining in character as Chekov wasn't always easy for Anton Yelchin. "It's a little hard to stay in character with Chekov throughout, because he's so goofy," he admitted. (Star Trek Magazine Movie Special 2016, p. 86)
Anton Yelchin once joked that, in Star Trek Beyond, Chekov, much to Kirk's disbelief, is revealed to be Croatian instead of Russia, though the actor then clarified, "No, that is not true." Aspects of Chekov's depiction in Beyond that Yelchin approved of included the character getting to leave the ship, which the actor compared to the occasions Chekov Prime left the USS Enterprise in TOS, and take part in some action sequences, which Yelchin enjoyed performing. "I probably have more action than in any of the previous two films," he reckoned. (Star Trek Magazine Movie Special 2016, pp. 86 & 87)
In the screenplay of Star Trek, Chekov at one point physically fought with Kirk, about to stun him with Chekov's own phaser. However, he was assaulted by Kirk in retaliation, causing Chekov to drop his phaser, before Kirk was finally subdued by Spock. 
The decision to have Chekov, in Star Trek Beyond, become isolated with Kirk, away from the rest of the Enterprise crew, was made by Simon Pegg and Doug Jung, while they wrote the film together. "We liked the idea of the youngest and seemingly most naïve character pairing up with the slightly older statesman," said Pegg. (Star Trek Magazine Movie Special 2016, p. 77)
In the Star Trek video game, an audio log can be found in engineering where Chekov mentions he ran away at a young age to join Starfleet. One of the game's scenes involves the rescue of an injured Chekov, who must be helped to sickbay, but is still able to defend Kirk and Spock from the invading Gorn with his phaser.
According to the Star Trek iTunes movie app, Chekov was born in Tagnarog, Russia (the real-life home of Anton Chekhov). His mother's name was Anna (who is now deceased). His family spent several years at the Mare Imbrium colony on Luna. He graduated from Moscow State University in 2256, where he then enlisted in Starfleet, graduating from the Academy in 2258. It should be noted that he beat Big Blue in a game of 3D chess. Chekov received a special commendation for bravery in the line of duty during Enterprise's recent mission to Pollux IV.
According to the 2011 Star Trek: Starfleet Academy novel "The Gemini Agent", Chekov liked to run on the academy grounds barefoot. Due to his youth, he was often treated like a little brother by the older girls in his dorm. He was also known in the underground web for being a white hat hacker.