If you could go back and change your past, would you? Peggy Sue says yes. After going to her high school reunion and passing out, she wakes up back in high school, in her past. She can now make...

If you could go back and change your past, would you? Peggy Sue says yes. After going to her high school reunion and passing out, she wakes up back in high school, in her past. She can now make her future better. Or can she? It isn't quite that easy.