* Marty McFly is a typical teenager from 1985 who is accidentally sent back in time to 1955. He must adjust to the past and find a way to get back to the future.
* Dr. Emmett Brown is a brilliant scientist who is Marty's friend and helps him get back to the future.
* Jennifer Parker is Marty's girlfriend in 1985. She is also sent back in time to 1955 and helps Marty get back to the future.
* George McFly is Marty's father in 1955. He is a shy and nerdy teenager who is in love with Lorraine Baines.
* Lorraine Baines is Marty's mother in 1955. She is a popular and outgoing teenager who is dating Biff Tannen.
* Biff Tannen is the school bully in 1955. He is always picking on George McFly and trying to steal Lorraine Baines from him.