As of now, "Back to the Future 4" does not exist. While there has been ongoing interest and speculation about a sequel, the original filmmakers, including director Robert Zemeckis and producer Bob Gale, have repeatedly stated that they have no plans to make a fourth installment. They believe that the original trilogy, released between 1985 and 1990, completed the story satisfactorily. Any rumors about a fourth film are typically fan-driven or speculative rather than official announcements.

One of the most famous lines from "Back to the Future" is "Great Scott!" This exclamation is often used by Dr. Emmett Brown, portrayed by Christopher Lloyd, to express shock or disbelief. Another iconic quote is "Roads? Where we're going, we don't need roads," referring to the time travel capabilities of the DeLorean car. Both lines have become emblematic of the film's adventurous spirit and have left a lasting impact on pop culture since the movie's release in 1985.

As of October 2023, "Back to the Future" is available for streaming on platforms such as Netflix and Amazon Prime Video. Availability may vary by region, so it's best to check your local listings. Additionally, the movie can often be rented or purchased through services like Google Play, Vudu, and Apple iTunes. Please verify on the respective platforms for the most current availability.

The movie "Back to the Future" is titled so because it revolves around time travel, specifically the protagonist, Marty McFly, traveling back to 1955 from 1985. The narrative explores the consequences of his actions in the past on the future, particularly his own existence and that of his parents. The phrase "Back to the Future" reflects this central theme of returning to a pivotal time to alter events, ultimately aiming to ensure a better future. The film cleverly combines elements of science fiction, adventure, and comedy.