Power Rangers Lost Galaxy is a tokusatsu television series and the seventh season of the Power Rangers franchise, based on the 22nd Super Sentai series Seijuu Sentai Gingaman. The series was the first to follow the Sentai tradition of a new cast with each new series.
 Kendrix Morgan (Valerie Vernon), the first Pink Galaxy Ranger for this series, was killed off two-thirds through the season, marking the first time that a Ranger was killed off in the series. Kendrix was written out of the show as Vernon had left for a while to be cured for leukemia. Her treatment was successful and she returned for the season finale.
 Set after the events of the previous season, four young adults (Corbett siblings Leo and Mike, Kai Chen and Kendrix Morgan) are leaving for the space colony Terra Venture seeking a new world like Earth. They later meet mechanic Damon Henderson, and on the Moon, a tribesgirl named Maya who leads them to five mystical Quasar Saber swords on her home planet of Mirinoi. After pulling the Sabers out of a stone, Mike falls into a crevice, but not before passing his Sword onto Leo.
 With the Quasar Sabers, they morph into Galaxy Power Rangers and battle space villains from two different parts of the galaxy who include Scorpius, Trakeena, Deviot and Captain Mutiny. Along the way, they discover Galactabeasts (which eventually gain the power to morph whenever needed into Galactazords) and ally with the mysterious galactic warrior Magna Defender. Though he later dies, he manages to reveal that his host body is Mike and passes the Magna Defender powers to him.
 When Deviot revives the evil Psycho Rangers, the Rangers of Power Rangers in Space show up to aid the Galaxy Rangers in destroying them. During this saga, Kendrix Morgan, the Pink Ranger, sacrifices herself to protect the Pink Space Ranger and Terra Venture from Psycho Pink. Karone, sister of the Red Space Ranger Andros and former evil princess Astronema, is given the powers of the Pink Galaxy Ranger from Kendrix (who appears as a spirit), and joins the Rangers in the battle to protect Terra Venture.
 Deviot later reads secret words from the Galaxy Book; sending Terra Venture and himself into the "Lost Galaxy". Here the Rangers encounter Captain Mutiny and his Swabbies. These space traveling pirates live on the back of a massive space faring dragon inside a castle. Deviot reemerges and joins the Captain's fight against the Rangers and attempts to turn all of the citizens of Terra Venture into his slaves for the purposes of mining for "Earth". The colony escapes the galaxy after Mike sacrifices his powers to keep a portal open.
 After this, Deviot returns to Trakeena, but by this time, she has learned of his treachery and tries to destroy him. She chases him through the ship and into the cocoon that Scorpius made, fusing them together and driving Trakeena insane. Using her army armed with bombs, she cripples Terra Venture and destroys the Stratoforce and Centaurus Megazords. This forces the colony's people to evacuate to a nearby planet. Trakeena gives chase but the Rangers destroy her ship by self-destructing the Astro Megaship, but the explosion leaves Leo stranded on the moon. Trakeena, who survives the blast also, albeit scarred and injured, finally reaches her breaking point and uses the cocoon to transform into an insectoid creature to enter Terra Venture's wreck and use her power to set it on a crash course to the planet below to destroy it and the people. Leo enters and soon followed by the other Rangers try to stop her, but are slowly outmatched by Trakeena's new power. She is only defeated after Leo, using his Battlizer, blasts her at point-blank range nearly destroying himself in the process. By this time the colony is nearly crashed but the Galaxy Megazord diverts its course and lands it on a large clearing in an explosion, the colonists, having feared the worse for the Rangers, are relieved and overjoyed when they come out of the explosion on the Galactabeasts. After this, the Zords reveal to the Rangers they had landed on Mirinoi and return the swords to the stone altar. This restores its petrified inhabits and, to the joy of the Rangers, restores Kendrix to life as well. After this the colonists settle on Mirinoi as the series ends.
 The Space Rangers from In Space make a guest appearance in Lost Galaxy' 30th and 31st episodes ("To the Tenth Power" and "The Power of Pink") for a team-up story in each episode:
 The Psycho Rangers, the evil counterparts of the Space Rangers, are brought back by the villains of this series in episode 30 to assist them in a scheme to deal with the good Rangers - over the course of episodes 30 and 31, the Rangers are destroyed by the combined powers of the Space and Galaxy Rangers with Psycho Pink, the only Psycho Ranger to survive destruction after episode 30 with a second return (meaning she is the only member of her team to make more guest appearances in Lost Galaxy), being destroyed again and fully in episode 31, thus bringing an end to the guest appearance of the Psycho Rangers:
 Deviot brings the Psycho Rangers back, and abduct the Rangers. When Leo faces off with Psycho Red, he proves to be too powerful until Leo meets Andros, the Red Space Ranger. The pair rescue the other Rangers and are introduced to the remaining Space Rangers. Together they defeat the Psycho Rangers once more...except for one.
 Psycho Pink survives the battle with Cassie and Kendrix battle, and then uses the Savage Sword to damage Cassie's morpher, causing a pink energy storm that slowly depletes Cassie's life energy. Kendrix walks to the eye of the storm, and destroys the Savage Sword, but loses her life in the process.
 Deviot survives and returns to the Scorpion Stinger, begging Trakeena to take him back. She isn't falling for his charm this time and sicks Villamax on him. The battle leads to the storage area, where Deviot grabs Trakeena and plunges into the cocoon, while Villamax helplessly watches. A single being emerges; Trakeena and Deviot have fused into one! It is mostly Trakeena, with a few shades of Deviot. With only one functional engine left, Stanton decides that the colony must land. He shows high command, and the citizens, a new, nearby world he has discovered, perfect for human life. As Terra Venture prepares to land, it is attacked by the Scorpion Stinger. It blasts away at the lesser domes. Leo gets an idea, he and Damon steal a case of explosives from a Terra Venture cargo truck. Damon lures the Scorpion Stinger into following him as he runs down one of the access tubes. The Stinger's pinchers nearly miss Damon while Leo plants the explosive on it. Both Rangers make tracks as it counts down. The bomb blows up in the Stinger's face, hurling it off into space. With all engines destroyed, Terra Venture is forced to crash land on a moon. The central city dome detaches, as the rest is destroyed. The citizens try to pick up the pieces from the crash. But they aren't safe yet - the dome is cracking, and won't hold out much longer. 
 Commander Stanton decides to evacuate Terra Venture. Trakeena prepares all the remaining Sting Wingers for a massive invasion by strapping them with explosives and having them self-destruct and destroy anything they latch onto. Everyone is rounded up into shuttles to begin evacuation to the new world. Trakeena gleefully watches as Terra Venture nears its doom. Stratoforce and Centaurus stand guard as the Sting Wingers approach the colony. The onslaught is too much, as they overwhelm them, and slip into the colony. The Rangers face the army of incoming Sting Wingers and fight them with everything they've got. The Wingers' strategy of latching onto Rangers and exploding is wearing them down. Villamax watches in disgrace as Trakeena sends her soldiers to their deaths, and to harm innocent people no less. Villamax saves a little girl from the wreckage of a demolished building. She gives him a flower, which moves the honorable warrior. Outside the dome, the Stratoforce and Centaurus Megazords are destroyed, as the numerous Wingers self-destruct while latched onto them. Battered and beaten, the Rangers regroup after an exhausting triumph over the remaining Sting Wingers. Terra Venture has completed evacuation procedures, and several shuttles are carrying passengers to the new world. Trakeena orders Villamax to open fire on the shuttles, but he refuses, saying there is no honor in such a brutal and pointless assault. Enraged with his insubordination, she ruthlessly kills him. Kegler hardly has a chance to mourn and is threatened back into service. Villamax's sacrifice gave the Rangers enough time to bring around the Astro Megaship and open fire on the Scorpion Stinger. However, the Stinger rams the Astro Megaship, and grabs it in its pinchers, causing severe damage. The Rangers have no choice but to self-destruct the Megaship and escape in the Jet Jammers. The Rangers barely clear the explosion, but it sends Alpha and Leo hurling into space. The explosion sends the Stinger reeling, and it crash-lands on the moon, near the city dome. The shuttles have safely made it to the new world, and the passengers rejoice. The Rangers land on the new world and find Alpha in some bushes. However, there is no sign of Leo as he has crashed onto the moon, near the Scorpion Stinger and the city dome. He tries to radio his teammates, but without the Megaship, all communications are severed. 
 In 2012, Shout Factory announced that it had reached an exclusive distribution deal with Saban for shows such as Power Rangers and Big Bad Beetleborgs. Lost Galaxy was released on DVD in August as part of a Time-Life exclusive boxed set containing seasons 1–7 of the franchise's Zordon (from Mighty Morphin until In Space) saga. The show later became available independently of the boxed set on March 10, 2015.