Back to the Future Part II,

Marty McFly (Michael J. Fox) must travel to the year 2015 to save the future of his kids.  While there, Biff Tannen (Thomas F. Wilson) steals the time machine and gives his younger self a book containing 50 years of sports statistics, which the young Biff uses to amass an enormous gambling fortune and transform idyllic Hill Valley into a living nightmare. To restore the present, Doc Brown (Christopher Lloyd) and Marty must return to the events of their previous adventure in 1955 and retrieve the book.

Props from BTTF II are the easiest to find of the three.

Fun Facts

• Elisabeth Shue was cast as Jennifer, and all the closing shots of Back to the Future (1985) were re-shot for the beginning of this film. Claudia Wells (Jennifer in Back to the Future (1985) had disappeared from the acting scene in 1987 for undisclosed reasons.

• When Marty arrives in 2015, he looks in the window of an antique store, where there is the jacket that he wore in 1985, a Roger Rabbit doll and a Jaws (1975) Nintendo game.  Who Framed Roger Rabbit (1988) was also directed by Robert Zemeckis.

• A movie theatre advertises "Jaws 19", directed by "Max Spielberg". Executive producer Steven Spielberg, who directed Jaws (1975), has a son named Max.

• When Doc sees the future newspaper headline change to tell him that he was "commended" instead of "committed," a headline at the bottom of the page changes from "Nixon seeks fifth term" to "Reagan seeks second term."

• Crispin Glover played George McFly in Back to the Future (1985),  but was replaced by Jeffrey Weissman in Part II.  Weissman was made up to look like Glover so that this film could incorporate excerpts from the original.

• The two police officers are named Reese and Foley, which are the names that director Robert Zemeckis and screenwriter Bob Gale use for any police or government agents in the films they have written.

• Biff fades out of 2015 after stumbling out of the DeLorean and behind some trash cans.  His demise was softened after initial audience screening failed to understand his reason for his death.

• The original script was called Paradox.  As shooting was proceeding, they realized that there was too much material for a single movie.  It was decided to continue without rewriting or cutting and release as two films.