On the distant planet of Mirinoi, the insidious forces of the alien monarch Scorpius attack and terrorize the population, eager to seize the Quasar Sabers, five swords entrapped in stone, waiting for five brave warriors to free them and use the Quasar Sabers for good.
Whilst Leo, Kendrix, Maya, and Mike battle Furio and the Stingwingers on Mirinoi, Kai enlists the aid of Astro Megaship technician Damon and Alpha 6 to help him pilot the vessel into the maverick wormhole and assist his friends. Once all six have been assembled, five of them are drawn to the Quasar Sabers, and free them from the stone, but a tragic turn of events leaves only four of the chosen left, will a new leader rise to the occasion?
Maya hears the distant pleas of help from five Galactabeasts held captive by Scorpius’s forces. She persuades the remaining Rangers to take the Megaship to the planet the Galactabeasts are held on and free them.
Leo, desperate to find a purpose on Terra Venture starts training for a job at the GSA. Meanwhile, a monster named Horns plots to steal the Quasar Sabers to add to his collection of rare items.
A young stowaway is discovered aboard Terra Venture, but far out of distance from Earth, he will never be able to see his mother again. The Galactabeasts are struck down by Scorpius;’ latest monster, but reveal new secrets that allow their Ranger allies to form The Galaxy Megazord.
Scorpius and Furio manipulate Leo into opening a cave containing the mystical Lights of Orion, an ancient power source that will enable whoever wields the lights with enough strength to rule over whole solar systems.
Kendrix becomes a stand-in for her identical double, a well-known actress, as Scorpius deploys another ferocious monster to locate the lights of Orion on the film set.
Kai becomes smitten with a beautiful ice-skater named Hannah, and begins lavishing her with attention.
With Scorpius eager to execute him, a disgraced Furio flees to Terra Venture to search for the Lights of Orion. He believes he has found what he has been seeking, only to be confronted by Leo. In the ensuing conflict, Furio sacrifices himself in a bid to slay his enemy and ensure neither possess the lights, but the Red Ranger is spared by The Magna Defender, a mysterious and powerful warrior seeking not only the Lights of Orion, but also revenge on Scorpius.
When Maya makes a passing comment on the traditional beauty and meaning of sunflowers, an eavesdropping Treacheron and Scorpius assume that the sunflower statues on board Terra Venture contain the sufficient wisdom and secrets to locating the Lights of Orion. Meanwhile, The Magna Defender, eager to avenge the death of his son Zika at the hands of Scorpius, continues to interfere in The Rangers efforts to locate the Lights and begins to endanger innocent civilians.
A colossal sleep epidemic grips Terra Venture, cutting off consciousness from everyone except for Leo and The Magna Defender, who has successfully acquired the elusive Lights of Orion. Believing the power of the Lights can save the colony, Leo and The Magna Defender clash in an effort to control the Lights Of Orion.
Maya and Kendrix have a heated dispute when Maya selfishly eats an entire birthday cake intended for Damon’s surprise party. As the female members of the group bicker, Treacheron’s forces successfully track down the Lights of Orion.
Trakeena and Treacheron, at war with one another, attempt to lay claim to the Lights of Orion when they return to Terra Venture with the aid of their respective monstrous agents, but with The Magna Defender intent on using the lights for revenge, The Rangers are faced with the possibility they may have to destroy the lights.
Leo is wounded in a ferocious battle with the Shark Brothers, two monstrous creatures who liberate Treacheron from his imprisonment. Treacheron intends to exact revenge on Trakeena, but is faced with an injured, but determined Leo. Called back to action by the voice of his dead brother Mike, will the Red Ranger survive a brutal clash with Trakeena’s former enforcer?
The Scorpion Stinger, leaking fuel, begins to drain energy from Terra Venture’s Mountain Dome. Seizing an opportunity to destroy Scorpius once and for all, The Magna Defender intends to erupt the volcano in the dome and cause a chain reaction that will eliminate his enemy.
Mike, having been restored to life by The Magna Defender’s sacrifice, begins to rebuild his life on the colony. Leo, believing Mike to be the true heir to his Quasar Saber, contemplates returning it to him. Scorpius deploys another monster to take the Rangers hostage, leaving only the Corbetts to face Skeletron alone. Mike refuses the mantle of the Red Ranger, believing Leo has earned his position, but soon becomes aware of powers that he can use to continue the noble legacy of The Magna Defender.
Trakeena begins stealing the beauty from the females of Terra Venture.
Terra Venture receives a series of distress calls that lead them to an ancient and seemingly abandoned spaceship. However, when Mike and Leo lead a group of Terra Venture troopers on to the vessel, they discover that they are not alone, as a ferociously powerful and primitive alien threat threatens their lives.
Terra Venture’s top researchers attempt to unlock the mysteries of the recently discovered Galaxy Book. Meanwhile, a conniving cyborg alien, Deviot, arrives on board the Scorpion Stinger and offers his services to Scorpius.
The Galaxy Rangers defend Terra Venture from Deviot’s Zord armada without the aid of their reluctant Galactabeasts as Kendrix’s continued research of the Galaxy Book uncovers starting revelations.
On the planet Onyx, Trakeena meets the spirited warrior Villamax and his friend Kelgar. Sensing potential in her, Villamax agrees to train Trakeena and sharpen her skills as a warrior.
Hungry for revenge, Trakeena captures Leo and subjects him to a terrifying game where the stakes are terribly high, but the two of them soon become targets when Deviot deploys two assassins to kill Trakeena.
Maya’s childhood friend from Mironoi, Shondra, arrives on Terra Venture, allegedly through one of the planet’s various random portals. The reunion between the elated friends however is short-lived when Kendrix begins to suspect Shondra is behind an attempt to steal The Galaxy Book.
In desperate need of a mechanic to make vital repairs to The Scorpion Stinger, Trakeena arranges the kidnapping of High Councilor Reiner and demands Damon’s services in exchange for her safe return.
Kai is forced to question his loyalties to Commander Stanton when he begins acting strangely. Following his gut instincts enables the Blue Galaxy Ranger to uncover the truth, and is soon pitted against Stanton himself in a mental and physical battle of wills.
When a Mantis with a special interest in motorcycle racing captures Kendrix and Maya, transforming them into trophies, Leo must answer a challenge to out race The Mantis if he is to have a chance of recovering his friends
An ancient warrior called Loyax, having turned to villainy despite still carrying a code of honor, asks Trakeena to appoint him a task so he may have a glorious final battle against a worthy opponent.
Leo finds love can sometimes feel like Fort Knox when he discovers his new love interest, Ginger, has an overprotective older brother.
The Rangers face their most challenging opponent to date as they battle a warrior that has the ability to mimic the Rangers own moves and weapons.
Deviot receives five Data Cards from his profit-hungry sources, providing him with the opportunity to restore the terrifying Psycho Rangers to their full glory and use them in his campaign against the Galaxy Rangers. As each Rangers falls one by one, Leo is left seemingly alone against the overwhelming Psychos, until help arrives in the form of another Red Ranger, Andros.
The Psycho Rangers have been defeated, or have they? Rising from the remains of her comrades the Pink Psycho Ranger schemes to acquire more power than even Trakeena and uses Kendrix to discover the location of the Savage Sword, a weapon that could enable her Pink Ranger foes.
On the planet Onyx, a fierce bidding war is waged for the Pink Quasar Saber, with a former servant of chaos attempting to lay claim to it also, but now on the side of good once more, the former “Princess of Evil” is eager to redeem herself in more ways than one. A battle with Trakeena and a bid to save the Galaxy Rangers from her clutches leads to the rebirth of a hero and an heir to the legacy of the Pink Galaxy Ranger.
When Leo’s powers are destroyed by Magnetox, Karone must face down her past as Astronema if she is to retrieve a powerful set of keys that can restore them and also supply the Ranger’s leader with even more power.
Damon’s bid to become Terra Venture’s chief mechanic is soured when an opportunistic cipher called Baxter steals his ideas for a new Ultra-Sonic Transmitter weapon, and takes credit for them. However, when the colony attempts to make use of the device against Decibat, the half-finished schematics create problems. Damon and Baxter must join forces and complete the work before the monster tears the colony apart with his sonic screams.
An ancient warrior arrives on Terra Venture intending to take the Galaxy Book and safeguard it. When confronted by Kai, he informs him he has a special destiny ahead of him.
Stranded in the Lost Galaxy and cut off from their enemies, the crew of Terra Venture are welcomed by Captain Mutiny, a seemingly benevolent space alien, but when the Rangers discover he specializes in slave trading, they find themselves in a race to prevent Commander Stanton from accepting a “gift” bestowed to him by Mutiny as a gesture of good faith.
With the Grunchor, a fearsome being, starts tearing its way beneath Terra Venture, creating mass earthquakes, The Rangers are forced to first contend with Captain Mutiny’s army of Swabbies before acquiring a potential solution to halting Grunchor’s rampage…that is, if they can survive the trial and error of confronting the mammoth creature head to head.
Leo and Damon are captured by Captain Mutiny’s forces , tied up, and left to contemplate their recent past as they await the arrival of Mutiny himself at sunset, knowing he will bring with him the order to bring about their destruction.
When the dream-weaver Hexuba casts a spell that forces the Rangers to confront a host of enemies and chaotic situations in their dreams, it soon falls to Mike to awaken the Rangers from this nightmarish onslaught.
Hexuba’s next stratagem against the Galaxy Rangers is to resurrect several old enemies and unleash them one after the other. Kai elects to go on a dangerous mission within the heart of Hexuba’s lair to destroy the source of the rangers nostalgic nightmares.
Captain Mutiny elects to unleash his own beloved pet Titanisaur on Terra Venture, prompting the Rangers to rely on as many resources as possible to repel it.
When Captain Mutiny’s forces successfully capture several of Terra Venture’s citizens and subject them to slave labor on a nearby planet, Mike risks his life and goes undercover to retrieve them, in doing so he meets a young girl and her sickly Grandfather.
Deviot returns to the Scorpion Stinger and begs for Trakeena’s forgiveness, but the treacherous being has run out of chances and is mercilessly beaten by Villimax. In a desperate attempt to gain power, Deviot sends himself and Trakeena into the cocoon Scorpius had prepared for her intended imposed maturity, mutating and merging both entities into an insane, twisted and more thoroughly evil form.
With Terra Venture’s city dome left a hulking ruin on the moon nearest to the habitable new world, The Rangers, the Stratozord, and Centaurus fleets do whatever they can to hold back as swarm of suicidal Stingwingers. When leading an attack on the stricken colony, Villamax is touched by the care of a little girl, and he begins to question where his loyalty lies. Trakeena’s campaign of destruction eventually succeeds in overwhelming several of the Galactabeasts, forcing The Rangers to confront The Scorpion Stinger in the Megaship, but they are severally crippled in the ensuing battle. Leo makes a bold decision that separates him from the Rangers and sends him on a collision course with the moon.
A wounded Trakeena successfully enters the cocoon and completes her transformation, becoming a repulsive, yet formidable insect creature. She makes her way to Terra Venture’s crashed city dome and begins to levitate it, intending to bring it down on the evacuated colonists recovering on the neighboring planet.