Galvanax is the reigning champion of Galaxy Warriors, the most popular intergalactic TV game show in the universe where contestants from all over the universe battle to prove who is the galaxy's mightiest warrior. He has become determined to make himself invincible by controlling the mythical Ninja Nexus Prism, which contains the supernatural Ninja Nexus Star. Meanwhile the Prism, flying though space, lands at the house of Master Dane Romero, who chips off old fragments of the Prism's metallic coating, creating the legendary Ninja Steel. When Galvanax came to Earth soon after, Master Dane Romero fought him to keep him from obtaining the Nexus Star and apparently sacrificed himself to thwart Galvanax's plan, while in the process separating the Nexus Star into six separate Ninja Power Stars, though Galvanax and his minions Madame Odius and Ripcon made off with his son Brody. Ten years later, an enslaved Brody escapes from Galvanax's ship with the Prism, the Power Stars, and fellow slaves Redbot and Mick Kanic and returns to Earth, descending into the city of Summer Cove where they meet high school students Preston Tien, Sarah Thompson, Calvin Maxwell and Hayley Foster who manage to retrieve the Power Stars from the Prism and morph into the Ninja Steel Power Rangers. Furious at the outcome, Galvanax sends his warrior contestants down to Earth to steal the Prism where each epic battle against the Rangers is broadcast throughout the universe. Together, the Rangers must master their arsenal of Power Stars, Mega Morph Cycles, and Zords, that are all made from the Ninja Steel, in order to stop this evil threat and save the Earth from destruction.
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