In this climactic conclusion to the World's End arc, the X-Men confront the Hauk'ka, a race of dinosaur-like beings in the Savage Land, who aim to reshape Earth into a prehistoric world. As global temperatures plummet, causing widespread panic, the X-Men, alongside allies like Ka-Zar and the Savage Land Mutates, launch a final assault on the Hauk'ka's citadel. Their mission: to free Storm from the Hauk'ka's control and prevent a new ice age. The battle tests the team's unity and resilience, culminating in a fierce confrontation that determines the planet's fate.