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.

A human named Toru 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 daughter Yelana, Yelana's Brother Dexter, had successfully ran away

Yelana: Dad!!!

Galvanax: Take her to the ship.

Ten years later, an enslaved Yelana 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 Izumi, Xandra, Amy, and her Brother Dexter, who manage to retrieve the Power Stars from the Prism and morph into the Ninja Steel Power Rangers.

Name: Yelana Kazedara Ranger Color: Red Position: Leader

Name: Izumi Ishikawa Ranger Color: Yellow Position: Member

Name: Dexter Kazedara Ranger Color: Gold Position: Member

Name: Xandra Kaylin Ranger Color: Pink Position: Member

Name: Amy Torizawa Ranger Color: White Position: Member

Name: Katsumi Higarashi Ranger Color: Purple Position: Member

But there was still something missing, the Blue Power Star was still missing since someone already took it, but when Yelana found the Prism, the Blue Power Star was already gone

Amy: Woah! This is so cool!

Izumi: Same here, Babe!

Xandra: Yelana, right? Why are Monster's chasing you?

Yelana: Because i stole the Nexus Prism.

Dexter: At least you're back, Sis!

Katsumi: But you said that there was a Blue Power Star? Right?