3 years after their victory in Rio De Janeiro, Kong rules Hollow Earth while Godzilla protects Earth's surface. Peace is shattered when Monarch scientists unexpectedly activate a crystal in the Iwi Temple creating SpaceGodzilla, a corrupted evil Godzilla who destroys the temple and kidnaps Suko, Kong's adopted son. So now Kong, his new family, Godzilla, Mothra, and Shimo team up to travel to the surface and rescue Suko from SpaceGodzilla hidden in his crystal fortress. Along for their journey is Monarch's newest weapon, a combat-ready size-scaling robot powered by B.E.A.S.T. technology, Jet Jaguar.