The Federation First Fleet battles the USS Vengeance

Captain Sulu took the USS Excelsior near the Klingon border when the moon Praxis exploded. The explosion opened a vortex in which the USS Vengeance, a Federation warship with a jet black hull, emerged. The Vengeance was designed by Commander John Harrison (aka Khan) and commanded by the evil Admiral Alexander Marcus. The Vengeance came from the alternate reality created by the Romulan captain Nero. The Klingons attacked the Vengeance with 3 K'Tinga-class battle cruisers and she destroyed all 3 but suffered bad damage. Sulu reported the incident to Starfleet, which sent the entire Federation First Fleet to intercept the Vengeance. A fierce battle ensued in which 6 Federation starships were destroyed and another 10 suffered bad damage. The Vengeance was not so lucky. She was destroyed with the loss of all hands, including Admiral Marcus.