Lord Zedd’s arrival has forced the Rangers into a desperate fight, and their original Zords are no longer enough to deal with his powerful new monsters. A new generation of machines is about to enter the battle as the Rangers receive the Thunderzords. Their new powers give them a chance to fight back, but learning to control unfamiliar Zords while confronting Zedd’s forces will not be easy. With Piranhtis Head threatening Angel Grove, the Rangers must quickly discover what their new machines can do and prove that they are ready for the challenge created by their most dangerous enemy yet.