The ISS Enterprise destroys Halka

When the Mirror Universe Captain James T. Kirk returned to the ISS Enterprise, the mirror Spock tried to convince him not to destroy the Halkans. The mirror Spock told his captain that destroying Halka would impede the Terran Empire's efforts to mine dilithium. The mirror Kirk refused to spare the Halkans. He gave the order to destroy the Halkan planet. The ISS Enterprise fired phasers on the Halkan planet and destroyed it, exterminating the Halkans and erasing their civilization from the universe.