Plot Summary

After the Rangers participate in a charity skydive, a giant egg in Angel Grove is unearthed. Lord Zedd (Mark Ginther) and Rita Repulsa (Julia Cortez) investigated the egg, and released the creature inside, Ivan Ooze (Paul Freeman). Zordon (Nicholas Bell) had trapped him inside the egg six thousand years ago, and then he left to seek revenge on Zordon. He disguises himself as a carnival wizard and gives free jars of purple ooze to children. Fred Kelman, the Rangers' young friend, buys a jar, and brings it home. Later on, his father finds the jar and inspects the ooze. When he pulls some out, mysterious charges of purple electricity go through him, putting him under the control of Ivan Ooze along with all of the other parents of Angel Grove. Apparently this ooze only affects the parents, as it is later seen that the children and teens are not affected and are playing with the ooze.

When the Power Rangers are sent to fight Ivan's Ooze Men, the Command Center is left defenseless, allowing Ivan Ooze to destroy it, almost killing Zordon and weakening and slightly diswiring Alpha 5 in the process. Due to the destruction, the Power Rangers lose their powers, and they must go on a quest to find new Ninjetti powers on the distant planet of Phaedos. When Ivan sends his Tengu Warriors after the Rangers, they are assisted by Dulcea (Gabrielle Fitzpatrick), who bestows upon the Rangers new Ninja powers based on the six Ninja animals: the Falcon, the Ape, the Bear, the Wolf, the Crane, and the Frog (much to Adam's dismay, though Dulcea cheers him up by alluding to the story, The Frog Prince, and kissing him on the forehead in the process). Dulcea directs the Rangers to find the Ninjetti Temple to find the Great Power on their own, as she will age rapidly if she takes one step off the plateau. On their way, they must battle a living dinosaur skeleton and at the temple, four living statues. When the statues are finally destroyed, the Great Power is bestowed upon them and they become the Power Rangers once more.

When the Rangers return to Earth, they find it under attack by Ivan's Ectomorphicon Titans, and they call upon their new Ninjazords to battle the Titans. They destroy Scorpitron, and then form the Ninja Megazord to battle Hornitor. During this time, the children of Angel Grove realize that Ivan plans on killing all of their parents. Fred leads them to the construction site where Ivan directed the adults to fall into a massive hole. When Ivan fuses with Hornitor, the Rangers form the Ninja Mega Falconzord to try and destroy him, eventually using a comet that was to pass the Earth to destroy him. Upon his destruction, the parents of Angel Grove snap out of his spell and embrace their children.

The movie ends with a celebration in the Angel Grove harbor, thanking the Power Rangers for saving the world, although Bulk and Skull complain it was themselves who saved the day.