Metalions

Leonard overtrains the Mega Beasts, trying to get them to perform another five-beast fusion, and injures them accidentally. Meanwhile, Agent R and Sigma have back-engineered a new Frog Robot out of old Metalion technology, and are using it to cause a fog in London. The Eco Team finds both the source of the pollution and a passenger jet which has been circling in the fog. The boys split up and Elon and the Infinite Warriors go after Sigma, while Leonard calls the Mega Beasts to try to save the plane., Elon and the Infinite Warriors battle with Agent R and his new sonic weapon in the city streets around Big Ben. Meanwhile Leonard and Argentavis try to land a plane. As the battle continues, the success of the mission may lie with Leonard and whether or not he can figure out how to fuse his five Metalions.