The USS Hood joins forces with the United Federation of Klingons

The Constitution-class Federation starship USS Hood, trapped in the Mirror Universe, joined forces with the United Federation of Klingons. That was after the USS Hood saved mirror-Qo'noS from the Terran Empire's Planet Killer. In gratitude for saving their homeworld, the Klingons escorted the USS Hood to the Romulan border. The USS Hood and the Klingons fought the Terran Empire.