An armada from The Lacertillian Empire - Tara's people - are on the way to Earth and nobody knows why. There are only days before the strongest battlecruisers from the largest and most dangerous empire in the galaxy arrive and our girls are on the clock to help their headmasters figure out why they're coming and how to defend the world. Are they coming to eliminate Misako after destroying her home planet? Are they coming to reclaim Tara for some crime of her family? Or is there something far more dangerous on their agenda? Tara, Misako, Summer, Kat, and their friends are back and this time the fate of Earth is in their hands. Let's just hope they figure it out in time!