LOS ANGELES, Oct. 24 (UPI) -- Back to the Future, returning to theaters Friday, became a phenomenon following its 1985 release. The film's enormous popularity led to fans celebrating significant dates from the movie each October and November, with viewers now able to revisit the movie for its 40th anniversary.

Then at the height of his Family Ties fame, Michael J. Fox stars in Future as Marty McFly, a teenager living in Hill Valley, Calif. The character is a high school bandleader who is friends with the town's infamous scientist Doc Brown (Christopher Lloyd).

After Doc invents a time machine, Marty is accidentally sent back to 1955 in his place. In the past, he has to convince the younger Doc to invent a time machine and figure out how to send him back to the future.

Along the way, Marty prevents his father, George (Crispin Glover), from meeting his mother, Lorraine (Lea Thompson). With his own existence at stake, Marty has to play matchmaker for his teenage parents, all the more challenging when Lorraine develops a crush on her future son.

Back to the Future originally opened in theaters July 3, 1985, but the month of October is featured prominently in the film. For example, Oct. 26, 1985, is the date Doc unveils his time machine to Marty at the Twin Pines Mall.