The day after she goes to a night club with Leelee, Vida returns to Rootcore nearly 24 hours later, displaying multiple personality changes. Aside from that, she seems fine, but upon closer inspection, Chip unmasks her as a vampire (the sun weakens Vida when the Rangers transform into Mystic Titan Dragon Formation)! After the Rangers destroy Flytrap, the citizens of Briarwood return to normal, and the Rangers think it is all over... until Chip's "Vampire Chalk" traps Vida.

When Clare learns of her mother Niella's legacy, she takes on the Gatekeeper's role. While she is victorious against Necrolai, she tries to overpower Koragg after he kidnaps Udonna and forces Clare to fight him. Clare is ultimately seized by Necrolai and used to raise the gates to the Underworld.

Jenji gets jealous of Fire Heart and takes the baby to live in the forest. Meanwhile, Imperious challenges Koragg to fight without magic and gives Koragg's magic to Necrolai in the form of a purple Mystic Morpher. With it and the new harpy creature Screamer, she leads an assault and immobilizes all Rangers except Madison. She and Jenji show up and destroy Screamer with a combination of Jenji's "Super Cat Attack" and Madison's water-based "Jenji Shining Attack". Back in the forest, Fire Heart has grown to monstrous proportions, and when Udonna confronts Phineas about his "saving a second baby", she learns that her son Bowen is still alive in the human world.

Udonna and Daggeron grow concerned when the Rangers start to become lazy and use magic for even the smallest of tasks. Meanwhile, Imperious summons the Barbarian Beasts to fight the Rangers and take out Koragg (knowing that the Knight Wolf will not allow him to make a move against the Master). When fighting becomes too tiring, the Rangers want to resort to using Jenji. Daggeron repeatedly refuses, but the Rangers' persistence convinces Daggeron to use the "Jenji Shining Attack" on 50-Below and Fightoe. Jenji is subsequently captured and taken to the Underworld, while Koragg is gravely injured after taking on the Barbarian Beasts without magic. Imperious, with Jenji at his disposal, wishes that there were no Mystic Force Rangers. The Rangers leave the magical realm when suddenly Imperious' wish starts to take effect. Daggeron is erased from existence, a dark force overtakes Rootcore, and the color is drained from the world.

The Rangers find that the city has been overrun with Imperious' forces, led by Necrolai. Music is banned from the world, Rootcore has been destroyed, and the Rangers have lost their magic. When Koragg finds them in the forest, he tells them what has happened that the only way to reverse Jenji's wish is to see the Tribunal of Magic, which they can reach by riding Fire Heart (raised by Koragg in this alternate universe). In this other dimension, the Rangers wander through the desert until they ultimately find a door leading to the Tribunal of Magic. The Tribunal asks why the Rangers have come. After a short conversation, the Tribunal declines the Ranger's request to reverse the wish, sending them back to Briarwood, powerless. Deciding that they now have no hope, the Rangers are quickly captured by Necrolai's forces as the Tribunal sees the Rangers' surrender as proof they've made the right decision.

As Udonna and Daggeron tell the Rangers of how Leanbow was sealed away in the Underworld, Imperious plots to use the Rangers' Legend power to revive The Master. He has Koragg deal with the Rangers. While fighting Daggeron in the Dimension of Wandering Souls, Imperious tricks Daggeron by using the Solar Streak Megazord's energy and the spirits of the monsters slain by Leanbow to create the Chimera. After Imperious disposes of Daggeron, Chimera and Koragg capture the Rangers. Udonna uses a spell to travel to the Underworld, but The Master quickly strikes her down. Koragg's visions intensify into an onslaught of flashbacks, and when he finally realizes the truth, he attacks the Master, saves Udonna, and assumes his true form: Leanbow.

The second of the Ten Terrors is chosen to destroy The Light. When Oculous immobilizes four Rangers, Nick summons Fire Heart and unlocks the power of the Mystic Battlizer to kill him and get his friends back. Meanwhile, Megahorn breaks the sacred rules and sets out on his own to battle Daggeron, as Udonna finds a familiar face is following her.

Hekatoid has captured Udonna, and the Rangers chase after him in his dimension to rescue her. Daggeron, in the real world, tries to stop all the tadpoles Hekatoid has laid from destroying the world.

Itasiss is chosen to destroy the surface world. Refusing, she tries to convince the remaining Terrors of the thing called courage; she is killed anyway. The Master decides to take care of things himself, starting with the Light/Nick-Bowen. After taking over Nick's mind and body, he proceeds to destroy the Mystic Village. Nick then dons Koragg's armor, taking Leanbow with him to Rootcore for a showdown, trashing it in the process. Nick breaks free of the Master's evil hold, expelling him into the real world. The Snow Prince appears in Rootcore, bringing news that the Mystic Realm has been destroyed and Mystic Mother (a reformed Rita Repulsa). While Daggeron and Leanbow fight in the Mystic Realm against the Master, Udonna takes on Sculpin, and the Rangers continue their fight with Black Lance. The Rangers, and Udonna, are seemingly defeated as they lay on the ground, powerless. Leanbow and Daggeron combine their powers in one final attempt to destroy the Master, but their magic is too weak. After The Master devours their magic, Daggeron takes a blow for Leanbow and is killed. In the upper world, Jenji shields the Rangers from one of Sculpin's attacks and is destroyed. Meanwhile, Udonna is taken to the underworld by Sculpin.

Nick, not willing to give up, fights Black Lance, destroying him with the other Rangers. The Master arrives, spitting out a dead Daggeron and Leanbow before he devours time until they are in the future, a dead, barren, and dark wasteland. After fighting the Master in Legend Mode, their Legend powers are taken away. Nick uses all his remaining power and forces the Master to spit out the time he devoured. Though The Master threatens to destroy them, they are saved by the Snow Prince and Clare. Mystic Mother lived by turning herself into energy before being killed. As the Master retreats, Udonna appears with Itassis and Necrolai. Itassis tells how Necrolai saved her and destroyed Sculpin with the power of courage. Leanbow and Daggeron are revived by Necrolai, while Jenji returns to his normal self. Necrolai was turned into a human thanks to the good energy she absorbed. The humans, led by Toby, and the mystical creatures, led by Phineas, band together to return the magic to the Rangers. The Rangers take on the Master with all their power, destroying him with their overwhelming magic. The story wraps up with everyone working together, the worlds united, and having a party in Toby's store with a revived Matoombo. Madison tells Nick to come back for her, and he gives her his baby blanket. Meanwhile, Nick, Udonna, and Leanbow ride off into the sunset, with Fire Heart rushing behind, while Clare is now a sorceress and resident of Rootcore.