The villains of the Power Rangers universe that appeared in the television series Mighty Morphin Power Rangers and the film Mighty Morphin Power Rangers: The Movie were aliens serving or allied to Rita Repulsa and/or, later, Lord Zedd, including the warrior Goldar. Information about the other villains can be found below.
For the purposes of this article, the mini-series Mighty Morphin Alien Rangers is considered to be a part of the third season of Mighty Morphin Power Rangers. Villains from the movie, Mighty Morphin Power Rangers: The Movie, while they are covered in this page, are not considered part of Power Rangers television continuity.
Rita Repulsa was the primary antagonist for the first season, and later returned during the second to marry Lord Zedd. She is the daughter of the first evil monarch of the MG-51 planet, Master Vile. She has a brother named Rito and, via Zedd, a son named Thrax.
It was also mentioned in "Power Rangers: Turbo" that Divatox was a friend of Rita, possibly a relative, when she asked Rita for advice on how to defeat the Power Rangers on the phone. Rita mentioned that if she knew how to defeat the Power Rangers, she wouldn't be trapped with Zedd, and faced the phone towards him, who was snoring in his sleep.
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Links: Wikipedia Writer's Guide To The PR Universe Power Rangers Universe