For the primary universe counterpart, see Halkan.

Tharn, the leader of the Halkan Council

In the mirror universe, the Halkans were the species native to the planet Halka.

In 2267, the Halkans were exterminated by Captain James T. Kirk following his return to the ISS Enterprise as they had refused to share their planet's vast deposits of dilithium with the Terran Empire. Science officer Spock had tried to find a reason for sparing the Halkans as directed by Kirk's counterpart from the primary universe. Nevertheless, Kirk refused to listen and ordered their annihilation. (TOS episode: "Mirror, Mirror"; TOS - Mirror Universe novel: The Sorrows of Empire)

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