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The Rangers discover cracks in the earth where water from the Netherworld is seeping in; a Nighlok uses the evil water to keep from drying out.
The Rangers must defeat an armored Nighlok without Antonio's help.
When a Nighlok traps the spirits of four rangers, Mike and Emily must figure out how to defeat him and save their friends.
Antonio's teammates try to help him conquer his new fear of fish. Meanwhile, Master Xandred gains an ally in his plan to flood the planet.
Octoroo kidnaps Antonio and Mentor to use as bait in order to lead the other Rangers into a Mooger trap.
A boy unlocks an ancient seal, unleashing the very first Samurai Zord.
Mia's younger brother comes to town trying to convince her to sing in his band.
Kevin is unable to help the team when a Nighlok eats his Samuraizer; Dayu and Deker make a deal with Serrator.
The Rangers battle a Nighlok that creates mirror images confusing them; Spike looks for a job to help Uncle Bulk.
Emily loses confidence; a Nighlok's black sand causes desperate hunger and thirst in the Rangers.
Kevin and Mike must work like a team when a Nighlok glues their hands together.
Serrator spreads paranoia throughout the residents of Monalua.
Jayden doubts that he has what it takes to be the Red Ranger; Master Xandred demands Serrator return Dayu's Harmonium.
The Rangers discover that Serrator's recent attacks have an ulterior motive - to crack open the earth and let the Sanzu flood it and thereby become ruler of both worlds.
When Serrator asks Deker to fulfill the final piece of his destructive plans, Antonio begs Deker to reconsider his role in the battle between humans and the Nighlok.
The Nighlok Fiera unleashes an overwhelming attack on the Red Ranger, but when he goes down another Red Ranger takes his place. Which one is the real Red Ranger? The answer will change the Samurai Rangers forever.
As the Rangers attempt to adjust to being led by a new Red Ranger, Jayden struggles to find new meaning in his life.
Jayden finishes his grand battle against Deker and the other Rangers try to convince him to rejoin their team before Master Xandred reawakens.
With Master Xandred back on Earth, the Rangers finally attempt to use the Sealing Symbol to stop him - only to discover that he has a special new defense against it. Now, they must rise to the challenge and find a new way to defeat him and save the world.
In a climactic battle, the Rangers face off against Master Xandred for the last time.
Master Xandred and Octoroo deploy a mind-bending Nighlok named Trickster, trapping the Power Rangers in a series of horror movies. The Rangers must figure out what is reality and what is illusion. Will the Rangers escape the nightmare?
After battling a humbug of a Nighlok, GRED, the Samurai Rangers find themselves stranded inside a malfunctioning Megazord! Will the Christmas spirit, determination and, teamwork be enough to get the Rangers home in time to celebrate the holiday?