Picking up where the first part left off, Back To The Future Part II was released in 1989, four years after the first film. Both this film and Part III were filmed back to back as there were concerns that Michael J. Fox might start to look too old to play Marty McFly.
Part II is my personal favourite, although it is probably also the most confusing of the trilogy since it involves the most actual time travel of the three films. At the start of the film, Marty and his girlfriend Jennifer are whisked into the future by Doc Brown to “do something about their kids”, Marty Jr. and Marlene (both played by Michael J. Fox). Marlene isn’t in any real trouble but Marty Jr. falls foul of Griff Tannen (Biff’s son) who is going to involve him in a robbery, which leads on to the break up of the McFly family. Doc Brown wants to prevent this, so brings Marty to the year 2015 to pretend to be his son.
Marty angers Griff, which leads on to the well loved hoverboard seen, a recreation of the skateboarding scene from the first film. This alters the future, saving the good name of the McFly party, as Griff smashes into the town hall and the robbery never takes place. Unfortunately, Marty gets a little greedy, and buys a sports almanac from a shop that contains the results of sporting events from the last thirty years. Doc Brown discovers this, and throws the book in a rubbish bin. Trouble is, the elderly Biff Tannen overhears Marty and Doc Brown talking and claims the book for himself, stealing the DeLorean time machine and travelling back to 1955 to give the almanac to his younger self.
Marty, Jennifer and the Doc now return to 1985, thinking their work is complete, but discover a few changes have occurred to their home town of Hill Valley. The town is now a real mess, and lording over it all is Biff Tannen, now a millionaire who lives in a massive casino in the town square. Worse still, Marty’s Mum is married to Biff who is now Marty’s stepfather. Realising what must have happened, Marty discovers that Biff received the almanac from his future self on November 12th 1955, coincidentally the same date that Marty first travelled back to.
Marty and the Doc travel back to 1955 again to try and prevent Biff from getting the almanac. This is complicated by the fact that Marty must avoid bumping into the other Marty who is already in 1955, which ends up with a recreation of the first Marty’s guitar performance at the Enchantment Under The Sea dance, with the second Marty ensuring his performance goes without a hitch.
Having saved the day – again – Marty and Doc Brown return to their hidden DeLorean to go back to their own time, but by now the storm that got Marty home in Part I has started, and the DeLorean gets hit by lightning and disappears from sight, leaving Marty stranded in 1955, and setting us up for the conclusion in Part III.