Admiral Thrawn and Darth Vader have to team up to get the task done otherwise the Empire has come under a serious kind of threat. Though the two never wanted to work side by side with each other because they hate one another but still had to join hands because there is no other way. Neither of them has ever supported the other for any cause but this one is a unique and tough case.
The seriousness cannot be left aside because the fate of the Empire lies in the hands of these two. If they start going in their own ways then the entire structure will collapse within no time. There are other characters too who come face to face for the first time in this part of the series so there are several things that Marc Thompson had to narrate for the first time in this show.