Captain Sulu took the USS Excelsior near the Klingon border when the moon Praxis exploded. The explosion opened a temporal vortex in which the Super Star Destroyer Executor emerged. The Klingons attacked her 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 her. A fierce battle ensued in which 6 Federation ships were destroyed and another 10 suffered bad damage. The Executor was not so lucky. She was destroyed with all hands lost, except for Darth Vader, who escaped in his TIE Advanced fighter. He landed on Rigel XI. A second temporal vortex opened and 3 Rebel ships appeared and they hailed the Federation Fleet. The Rebels wanted to know where Vader's TIE F