Based on the hit children's television series The Mighty Morphin Power Rangers, this film has the teenage superheroes doing battle with the other-worldly villainess Divatox (Hillary Shepherd). She is the wife of an evil lord named Maligore who is imprisoned in an energy vacuum inside one of Earth's volcanos. Freeing him would mean doom for the universe. Divatox needs to bring a good wizard named Lerigot (Jon Simanton) to the volcano, because he has the key to unlocking the energy prison. Lerigot flees his planet and escapes to Earth just before Divatox's henchmen capture him. The five Rangers disguise themselves as ordinary teenagers, but their secret is discovered by ten-year-old Justin (Blake Foster), and he is allowed to don a power suit and become one of them. Zordon, the Power Rangers' boss, gives his crew extra powers to thwart Divatox, who with her pirates has captured a submarine. The showdown between the forces of universal good and evil includes plenty of karate and kick-boxing around a seething cauldron of lava.