Pavel Chekov

Pavel Andreievich Chekov was a Starfleet officer of the 23rd century, famous for his service aboard the USS Enterprise (NCC-1701) and USS Enterprise (NCC-1701-A), as navigator, weapons officer and security chief. He was briefly the first officer of the USS Reliant (NCC-1864) before returning to the Enterprise after the Khan incident. (, )

Chekov was one of James T. Kirk's most loyal crewmembers; he helped steal the Enterprise from Spacedock to rescue Captain Spock from the Genesis Planet, and later was an instrumental part of rescuing Kirk and Dr. McCoy from Rura Penthe. 

In 2293, Commander Chekov was one of the three Enterprise-A crew members present for the launch of the USS Enterprise (NCC-1701-B), and witnessed the "death" of Captain Kirk. 
 * A reporter called him Captain Chekov in Star Trek: Generations, but as he was wearing a commander's insignia, it is unclear if he had actually been promoted, or if it had been a simple slip of the tongue.

Gregarious and friendly, during his time aboard the Enterprise, Chekov was the best friend of Hikaru Sulu, and also shared close friendships with Nyota Uhura and other crew members.

Later career

 * According to various s published by :

By 2298, Commander Chekov had become the first officer of the USS Excelsior (NCC-2000), under Captain Sulu. As a Captain, he commanded the starships USS Potemkin and USS Cydonia. Chekov eventually rose to the rank of Fleet Admiral, and for a time was Commander-in-Chief of Starfleet. By 2377, Admiral Chekov was semi-retired, but was recalled to participate in the  crisis. (' : ', ' s: Federation, ', : )