K'Temoc was the captain of the Klingon ship T'Ong, whose crew woke from decades of suspended animation still at war with the Federation.
K'Temoc commanded the Klingon cruiser T'Ong in The Emissary. His crew had been placed in suspended animation more than 75 years earlier, when the Klingons and the Federation were enemies, and as the ship's systems began to revive them, Starfleet feared they would attack Federation outposts.
The special emissary K'Ehleyr proposed destroying the ship, but Worf suggested another way. He and K'Ehleyr posed as the captain and first officer of the Enterprise in Klingon uniform and told K'Temoc the war was over. K'Temoc resisted, but faced with Worf's resolve, he agreed to stand down.