(It's been a month since Godzilla has killed Ghidorah. The Earth has been peaceful during that month, until a massive alien empire known as the "Vortaak" show up and begin sending in their army of kaijus to conquer Earth. Starting off with Monster Island)

Godzilla along with his allies, wife and son stand before an army of alien kaijus. Sent by the Vortaak to subdue Earth's only possible way to defend itself. Then one of the alien kaijus stands up and points his scythe at Godzilla

Gigan: "So this is the Kaiju that killed Ghidorah's clone?"

King Ghidorah: "I am sure of it..."

Hedorah: "Look, it has a mini beside it-"

Gigan: "Enough talking! I could slaughter all of these weaklings all at once-"

Gigan is then smacked by Orga's giant hand and he falls to the ground. The grey strange looking Kaiju then looks towards Godzilla and speaks

Orga: "Forgive me for my comrade's aggressive attitude. I suggest a better option for the both of us. A tournament to determine if the Vortaak has the right to conquer this planet. If you win, we'll leave, but if we win... Earth is ours."