Awarru Tark arrives aboard the Star Destroyer Avenger in a YT-1300 freighter, answering Darth Vader’s call for bounty hunters to find the Millennium Falcon. When he meets with Vader he immediately launches a vicious assault on the Sith Lord with grenades and light blades that extend from his arms.
As Vader reaches into Tark’s mind he finds Awarru Tark is actually Stauz Czycz. Czycz underwent a surgical transformation to implant a force field generator into his body, so that he could attack Vader in revenge, having lost his own family to an Imperial assault on his homeworld.
Using telekinesis to disable the generator, Vader decapitates Czycz, leaving him to consider Czycz’s status as more machine than man.