Dalek Empire: The Exterminators

In 2004, The Exterminators was released by Big Finish Productions.

Cover blurb
Twenty years ago, Siy Tarkov set off from planet Velyshaa, making his way back to the Galactic Union, carrying vital information about a deadly race known as the Daleks. But now, he's lost in deep space... Meanwhile, the Graxis Wardens have a new recruit. But their ecological paradise is about to be plunged into chaos.