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The Gaira aliens, hidden in the Arctic, plan to conquer Earth. Captured and forced to work for the aliens, Dr. Yan creates the ultimate weapon, a transformable aerial robot called Gloizer X. Entrusted to his daughter Rita, Gloizer X escapes the clutches of the Gaira and lands in Japan, where pilot Jo Kaisaka meets a wounded Rita. Taking up the controls of Gloizer X, Jo and Rita fight against the Gaira invasion.