Despite the fact that they defied their superior's orders in order to save their loved ones, Dedron and Donna return to Earth after the conclusion of their last mission.

Expecting to be arrested for defying orders, they are instead recruited for a new mission for the Defense Squad. This time their old nemesis, Perbron the evil ruler of the Remoir, has returned to seek out revenge against the Defense Squad and the planet Earth.

The squad has received intelligence that Perbron seeks to destroy the Earth's agricultural and fuel settlements in order to deprive the humans of much-needed resources. Dedron, Donna, and their comrades will stop at nothing to prevent this destruction.

Will they be able to stop Perbron or has he set another trap to ensnare the Defense Squad?

Will Donna and Dedron be able to recruit Remoir resistance forces to assist them in their endeavor?

Will the happy couple defeat Perbron once and for all and be able to finally settle down and find happiness?