The show follows Brody Romero (William Shewfelt), Preston Tien (Peter Sudarso), Calvin Maxwell (Nico Greetham), Hayley Foster (Zoe Robins), Sarah Thompson (Chrysti Ane), and "Levi Weston"/Aiden Romero (Jordi Webber) who protect the Earth from Galvanax, a reigning champion from Galaxy Warriors who seeks the Ninja Power Stars to conquer the universe.
Mick Kanic is an alien slave from the Lion Galaxy with the ability to shapeshift into inanimate objects and was the head mechanic onboard Galvanax's ship until he, Brody and Redbot escaped via the garbage chute.
[4] In "Galvanax Rises", Dane's soul is revealed to have been preserved inside the Ninja Nexus Prism and is later revived without physically aging while also becoming another variation of the Red Ranger alongside Mick.
At some point after Madame Odius begins her final plan to enslave humanity while taking the power of the Super Ninja Nexus Prism for herself, Dane was among the brainwashed victims.
Against his will, he attacked both of his sons and Preston until Hayley and Sarah destroy the mind control satellite situated on the Galaxy Warriors airship, thereby freeing him and the rest of the brainwashed victims.
Realizing that he was lied to, Sheriff Skyfire agrees to help the Rangers while being informed of every monster that attacked Earth on Madame Odius' behalf.
In addition, he gives a morality lesson to the Rangers on respecting law enforcement like when Hayley got ticketed by Summer Cove High School's security guard Clint.
In "Helping Hand," Victor and Monty's magnetic device for shop class attracting the Ninja Stars which caught the attention of a Buzzcam.
[36] In "Doom Signal," Victor and Monty win Gorrox's audition, which led to them getting captured by Basherbots and used to entertain the Galaxy Warriors audience as part of Madame Odius' plan to brainwash the people of Earth.
In "Helping Hand," Victor and Monty's magnetic device for shop class attracting the Ninja Stars which caught the attention of a Buzzcam.
[36] In "Doom Signal," Victor and Monty win Gorrox's audition, which led to them getting captured by Basherbots and used to entertain the Galaxy Warriors audience as part of Madame Odius' plan to brainwash the people of Earth.
[7] Madame Odius is a sly kitsune-themed alien who is first seen as Galvanax's advisor until she is revealed to be the true main antagonist of the Ninja Steel seasons.
[37] Madame Odius later created a robot using Levi Weston's memories of being Aiden Romero in order to get close to the Ninja Steel Rangers' base.
[22] In "Echoes of Evil,” She and Cosmo Royale later encountered Sledge and Wrench, who escaped from a black hole and wanted the Ninja Super Steel Meteor in the Warrior Dome's ship.
The Ninja Blaze Megazord destroys Foxatron with the Ranger Blast Final Attack, forcing Madame Odius (who became scarred in the face) to retreat with Badonna and plan her revenge.
[4] The Aiden Romero Robot has Ripcon help him cause havoc in Summer Cove so he can find the Ninja Steel Rangers' base.
Upon being given a final chance by Galvanax and being framed for being the one who held Levi Weston on his ship, Ripcon is hit with the Gigantify Ray by Cosmo Royale, who also unleashes two Skullgators to help him.
[22] Cosmo Royale and Odius later encountered Sledge and Wrench, who emerged from a wormhole from the "Dino Charge" reality and wanted the Ninja Super Steel Meteor stuck to the Warrior Dome.
[36] During the Rangers' final battle with Madame Odius in "Reaching the Nexus", Cosmo Royale and Badonna were struck by explosive balls thrown by Victor and Monty which sent the Warrior Dome ship into outer space.
[7][d] Badonna is an Aonyōbō-themed alien who was originally a prisoner on Sledge's ship, which emerged from the wormhole leading from the Dino Charge reality's previous timeline.
[36] After the plot involving Game Goblin failed, Badonna tells Madame Odius that she has booked the Galactic Ninjas to appear in the next episode of "Galaxy Warriors".
During the Rangers' final battle with Madame Odius in "Reaching the Nexus", Cosmo Royale and Badonna were struck by explosive balls thrown by Victor and Monty, which sent the Warrior Dome ship into outer space.
[43] In "Magic Misfire," Madame Odius extracts the smaller General Tynamon from his armor and gives him a mind control weapon to use on Mick in exchange for his true form being enlarged.
While the Rangers respond to Buzzcam activity in Hill Crest Quarry that involves Brax, Tynamon sneaks into Summer Cove High School and uses Madame Odius's weapon on Mick.
After Hayley destroys Tynamon's armor by shooting at its face, the general bails from the body as Cosmo Royale gets approval from Madame Odius to use the Gigantify Ray on him.
[42] In "Magic Misfire," Brax appears at Hill Crest Quarry to fight the Rangers as a diversion so that General Tynamon can brainwash Mick.
When his Ranger Clone army was defeated, Lord Draven was enlarged when Madame Odius ordered the Gigantify Ray to be activated so that he can fire the final Mega Arrow.
[45] Four Foxbots were later combined by a spell from Madame Odius in order to create Foxatron, which is powered by the Ninja Medallions of Wolvermean, Speedwing, Rygore and Venoma.
[50] In “Gold Rush”, after Ripcon failed to defeat Levi Weston, which displeased the audience, Cosmo Royale unleashed a second Skullgator to fight the Ninja Steel Megazord.
[16] In “Family Fusion”, upon giving Ripcon a final chance to defeat the Rangers by Galvanax, Cosmo Royale uses the Gigantify Ray on him while unleashing two Skullgators to help him.