On 3 July 1985 Back to the Future was released.

The film tells the story of Marty McFly, a 17-year-old high school student, played by Michael J Fox, who is accidentally sent 30 years into the past in a time-travelling DeLorean car invented by his friend, Doc Brown.

The screenplay for the genre-bending story was rejected 40 times, but it became a Hollywood blockbuster, dominating contemporary culture and bringing its leading actor worldwide fame.

The film’s co-writer and producer, Bob Gale takes Josephine McDermott back to 1985, reflecting on how in the first draft of the script the time machine was a refrigerator and Einstein the dog was a chimp.

With movie excerpts from the 1985 Universal Pictures, Amblin Entertainment and U-Drive productions film, directed by Robert Zemeckis.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more. Recent episodes explore everything from the death of Adolf Hitler, the first spacewalk and the making of the movie Jaws, to celebrity tortoise Lonesome George, the Kobe earthquake and the invention of superglue. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: Eva Peron – Argentina’s Evita; President Ronald Reagan and his famous ‘tear down this wall’ speech; Thomas Keneally on why he wrote Schindler’s List; and Jacques Derrida, France’s ‘rock star’ philosopher. You can learn all about fascinating and surprising stories, such as the civil rights swimming protest; the disastrous D-Day rehearsal; and the death of one of the world’s oldest languages.

(Photo: Michael J Fox in Back to the Future. Credit: Sunset Boulevard/Corbis via Getty Images)