At 89, Koenig remains a cherished figure in the “Star Trek” community. Koenig’s ’Star Trek’ LegacyHe first joined the cast when “Star Trek” was in its second season in the late 1960s, portraying the youthful Russian navigator Chekov. Koenig continued to reprise the role across all six original-cast Star Trek films, cementing his place in sci-fi history. In addition to his “Star Trek” work, he earned praise for his portrayal of Alfred Bester on the acclaimed science fiction series “Babylon 5” in the 1990s. “Star Trek was the original…the best.