Rita is in a prison on the Moon. When she gets out of it, she wants to destroy Earth, because that's what she wanted to do before she was put in prison. She brings along her helpers, who were also in prison. One of them is called Goldar. He is a blue gorilla in gold armor who can fight better than anyone. To stop her, five teenagers are chosen by a wizard called Zordon. Zordon has an robot called Alpha 5 who helps him. The teenagers are given special magic coins that turn them into Power Rangers.