In an ancient subterranean world deep inside the Earth lies a power source sought by a cybernetics company to combat Godzilla... and only King Kong can acquire it. The two mammoth monsters are soon going head to head, wreaking havoc on an unsuspecting Hong Kong. But they may need to combine their colossal strength when metal menace Mechagodzilla rages out of control. Fourth entry in the combined "MonsterVerse" series stars Alexander Skarsgård, Millie Bobby Brown, Rebecca Hall.