Gregg Gregg was a Human male who served as a Lieutenant in the Imperial Navy . Biography . In 19 BBY , Gregg , along with the Sith Lord Darth Vader , was stationed aboard an " Imperial I " - class Star Destroyer , which was orbiting the planet Prine . Vader was tracking Jedi fugitive Dass Jennir , and a starship matching Jennir ' s was transmitting a signal from the planet ' s surface . After reporting that a ship involved in a recent break - in at Imperial Prison ISO - L8 was also detected , Gregg joined Vader and the two departed to the planet ' s surface . There , they captured the prison ' s intruder , bounty hunter Falco Sang . During the construction of the Imperial Palace in the aftermath of the Gentis coup , Gregg attempted to get Vader to listen to a plan of his , to which Vader had him walk with him to see Falco Sang ' s training . He , after giving his report on the progress of Sang ' s training , was then ordered to replace the droid ' s weaponry with live ammunition and supply orders to wound Sang only , and told him that he ' ll personally visit the training facility to give Sang more motivation . The next day , upon Vader ' s arrival , they acknowledged each others presence and proceeded to enter the facility . Gregg then smirked as he witnessed Vader telekinetically lifting an irate and disabled Sang and throwing him against a wall after Sang accused Vader of trying to have him killed . After the " Tenacious " disobeyed prior orders and left for Arkinnea , Gregg attempted to report this suspicious action to Vader , though Vader rebuked him , as it didn ' t supply any apparent , immediate relation to Jedi hunting . Gregg , after one of Sang ' s escape attempts , had the containment facility redesigned to have its doors voice - coded and dead - locked , so that in the event Sang tried to kill him , he won ' t be able to escape the prison . He then tried to request that Sang try to work with Vader regarding " [ getting ] Dass Jennir ' s head , " and inferred that Sang try to impress Vader by attacking him . He then revealed that they had delivered Sang ' s ship to the facility , and witnessed Sang ' s attempt to fight Vader to impress him . Later , while working late , Gregg was contacted by Emperor Palpatine himself . Glad that Gregg was still at his station , he told the lieutenant to supply vital information regarding Jennir ' s likely location , although he also swore to him , like before , not to reveal that he and Palpatine spoke . He then rushed to Vader ' s location only to stumble on Vader just getting out of his Qaddrath and informed him of Jennir ' s location at the Colonies world of Kestavel . Before he could finish , Vader ordered him to have Captain Gillehspy prepare the " Hound " to depart within the hour . Gregg complied with the order , but nonetheless was shocked that Vader planned on taking a " Venator " - class Star Destroyer over to the planet . He later accompanied Vader to Kestavel , where the latter attempted to attack The Lucky Twi ' lek hotel . However , the mission met complications upon learning that the hotel released engine fuel over the bridge , although Gregg pointed his blaster to his fellow officer ' s head and told him to not aid Vader , as the latter ordered that none were to interfere in his mission , not even to aid him . He then believed Vader to have been killed when he saw an immense blaze at the area via his electrobinoculars .