To mark the 30th anniversary of Back to the Future, Amazon is offering the trilogy for free to its Prime members.

Incidentally, Oct. 21, 1985 is also the day that Marty McFly travels into the future.

This is heavy.

For those who are planning to have Back to the Future movie marathon at your '80s or '90s party, make sure you're on Amazon Prime, because for the whole month of October, Amazon possesses exclusive rights to stream all Back to the Future films. Meaning, the trilogy will be unavailable on other streaming websites such as Netflix, Hulu and Crackle.

Made possible by a partnership with Universal Pictures, this is the first that all three films will be up for grabs on one service, free of rental fees.

The special content deals are part of Amazon's plan to draw more viewers and sign-ups. Amazon is using this particular strategy to hook interest in the Back to the Future 30th anniversary DVD/Blu-ray special edition bundle, set to launch on Oct. 20.

Apart from the trilogy itself, another great thing about this home release is the extras, which includes all new original shorts such as Doc Brown Saves the World! starring Christopher Lloyd, an inside look at the 2012 restoration of the most iconic car in film history, a nine-part retrospective documentary from 2009 on the trilogy's legacy, two episodes from Back to the Future: The Animated Series and Tales from the Future six-part documentary. In addition, viewers will also be treated to audio commentaries, deleted scenes, archival featurettes, behind the scenes footage, music videos and a Q&A portion with Michael J. Fox himself.

Back to the Future was the highest grossing film of 1985. It rose to become a national phenomenon, which eventually led to a second film in 1989 and a third film in 1990. The franchise proved to be so successful that it yielded spin-offs, including an animated TV series, a motion-simulation ride at Universal Studios Theme Parks and a video game for various platforms. This sci-fi adventure film was written and directed by Robert Zemeckis and produced by Bob Gale and Neil Canton for Steven Spielberg's Amblin Entertainment.

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