 This article is about a historical event in the film Kamen Rider J.
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The term "Great Hatching" (大孵化, Daifuka) refers to a catastrophic event in the lore of Kamen Rider J, during which the alien group known as Fog, led by Fog Mother, unleashed a massive wave of destruction on Earth. This event occurred approximately 70 million years ago when Fog descended upon the planet. During the Great Hatching, Fog's monstrous creatures were "hatched" or released, leading to the annihilation of Earth's dinosaurs as they were consumed and wiped out by these alien beings.
This event established Fog as a powerful and ancient force capable of bringing devastation on a planetary scale, marking them as a significant threat when they returned to Earth in the present timeline of Kamen Rider J.