Back to the Future (1985/2007)

Directed by Robert Zemeckis

IMDb
Wikipedia
Chicago Reader

Back to the Future is available as a stand-alone DVD, but on other formats it’s only available as part of the Back to the Future trilogy.

Purchase the Universal DVD from Amazon
Purchase the Universal Back to the Future trilogy Blu-ray Disc from Amazon
Purchase the Universal Back to the Future trilogy 4K Ultra HD/Blu-ray Disc combo from Amazon

Back to the Future is or was available in various other editions and/or collections.