Robert, in the Red Ronin, and Godzilla team up to fight the Triax, who arrived on Earth. However, when Triax is overpowered, the Megans send down their other two monsters Rhiahn and Krollar to help it.
As the battle rages on, the Megans attack the Betans' base on the moon while the Godzilla Squad tries to coordinate the military counter attack against the monsters. During the course of the battle, the Betans' dome is breached, exposing them to the vacuum of space, and the Megans charge their monsters with an energy beam that makes them stronger than ever.
Due to this power boost, Krollar is able to chop off the head of the Red Ronin, deactivating it and knocking Robert unconscious, leaving Godzilla to battle the super-powered monsters alone.