Professor Moriarty wrote:
Seems pretty straightforward to me. (Spoiler warning!)
The Exeter tangles with some Tressaurians, a reptilian race the Captain encountered many years ago. These nasty lizardfolk have stolen a Tholian device that is capable of shifting objects into another dimension. When Exeter follows the Tholians to their home base, they discover a similar device millions of times more powerful that is using a star for a fuel source. This device is capable of shifting whole sectors of space into another dimension.
And that's where we left off two years ago.
What happens to the sector when it's shifted into another dimension?
Who knows?! Tune in to Act IV this Fall and find out!