Telok was a Klingon warrior in the Klingon-Cardassian Alliance in the late 24th century of the mirror universe. He served as a guard in the House of Duras for four years until he left, tired of the unpredictability of Lursa and B'Etor.

In 2370, he was serving on Terok Nor when Kira Nerys and Julian Bashir crossed over from the primary universe. (DS9: "Crossover")