Tell me, Doctor, where are we going this time?

Robert Zemeckis’s 1985 classic “Back to the Future” is celebrating its 30th anniversary this year and will be rereleased in the theaters this fall. A new Blu Ray version of the trilogy will be available as well.

The film, which propelled Michael J. Fox, Lea Thompson and Crispin Glover to various levels of stardom, holds up remarkably well.

The film is the story of Marty McFly (Fox) and his experience when he is sent back to 1955 in a time-traveling DeLorean, an invention of the cooky Doc Brown (Christopher Lloyd). While there he meets his parents, hapless George McFly and beautiful Lorraine.

Soon, he realizes that his arrival in 1955 has affected the future, essentially erasing his own existence. The reason? His mother has fallen in love with him rather than the man she is supposed to marry.

The film is a great comedy and a science fiction film. The humor derives primarily from the culture clash between the 1950s and the 1980s.

Consider, for example, what happens when Fox’s character asks a 1955 waiter for a Pepsi Free. (Okay, you might have to do some research on that one, but it is funny if you know what you’re listening for.)

The movie benefits greatly from its soundtrack, primarily in its uses of “Power of Love” and “Back in Time,” by Huey Lewis and the News and “Johnny B. Goode,” by Chuck Berry.

The film is great but it has some minor flaws. The characters while likeable are very stereotypical in their portrayals with George being an introverted nerd who is pushed around and can’t talk to girls.

Perpetual bully Biff (Thomas F. Wilson) is portrayed as a dolt who can barely insult someone without trouble.

Doc Brown, an overall great character, can be a little over the top.

Obviously, I don’t think the film is perfect, but I’m not sure that matters. Zemeckis capably blends science fiction and comedy and the result is a movie I can watch time and time again whether I’m in 1955, 1985, 2015, or 2055.

I give “Back to the Future” five DeLoreans out of five.