The Power Rangers have faced many enemies over the years, with some veteran Rangers continuing the fight against different forms of evil. These include an empire of machines, monstrous mutants and even a horde of ancient demons, but there's no foe as iconic as Rita Repulsa. The original enemy of Power Rangers franchise, this space witch has continued to become scarier and more powerful.
Source：https://www.cbr.com/mistress-vile-best-power-rangers-villain/
