Giant robotic monsters awaken beneath the Earth and begin attacking the planet. Hilo, DJ, Gina, and Izzy team up to stop them.
Gina becomes a stronger fighter, Izzy helps with inventions, and Hilo discovers that the robots are connected to his forgotten past. During the mission, Hilo is captured, forcing his friends to go and rescue him.
In the end, they realize the threat is even bigger than they thought and linked to Hilo’s lost memories.