With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Back to the Future Part II is a sequel.
text_B: Back to the Future Part II is a 1989 American science-fiction adventure comedy film directed by Robert Zemeckis and written by Bob Gale .. Robert Zemeckis. Robert Zemeckis. Bob Gale. Bob Gale. science-fiction. Science fiction film. adventure. Adventure film. comedy film. comedy film. Back to the Future. Back to the Future. It is the sequel to the 1985 film Back to the Future and the second installment in the Back to the Future trilogy .. Back to the Future. Back to the Future. The film stars Michael J. Fox , Christopher Lloyd , Thomas F. Wilson , and Lea Thompson and continues immediately following the original film .. Michael J. Fox. Michael J. Fox. Christopher Lloyd. Christopher Lloyd. Lea Thompson. Lea Thompson. Thomas F. Wilson. Thomas F. Wilson. After repairing the damage to history done by his previous time travel adventures , Marty McFly -LRB- Fox -RRB- and his friend Dr. Emmett `` Doc '' Brown -LRB- Lloyd -RRB- travel to 2015 to prevent McFly 's future son from ending up imprisoned .. time travel. time travel. Marty McFly. Marty McFly. However , their presence allows Biff Tannen -LRB- Wilson -RRB- to steal Doc 's DeLorean time machine and travel to 1955 , where he alters history by making his younger self wealthy .. Biff Tannen. Biff Tannen. DeLorean time machine. DeLorean time machine. The film was produced on a $ 40-million budget and was filmed back-to-back with its sequel , Part III .. back-to-back. Back to back film production. Part III. Back to the Future Part III. Filming began in February 1989 after two years were spent building the sets and writing the scripts .. Two actors from the first film , Crispin Glover and Claudia Wells , did not return for the final two .. Crispin Glover. Crispin Glover. Claudia Wells. Claudia Wells. While Elisabeth Shue was recast in the role of Wells ' character , Jennifer , Glover 's character , George McFly , was not only minimized in the plot , but also was obscured and recreated with another actor .. Elisabeth Shue. Elisabeth Shue. George McFly. George McFly. Glover successfully sued both Zemeckis and Gale , changing how producers can deal with the departure and replacement of actors in a role .. Back to the Future Part II was also a ground-breaking project for effects studio Industrial Light & Magic -LRB- ILM -RRB-  : In addition to digital compositing , ILM used the VistaGlide motion control camera system , which allowed an actor to portray multiple characters simultaneously on-screen without sacrificing camera movement .. Back to the Future. Back to the Future. Industrial Light & Magic. Industrial Light & Magic. digital compositing. digital compositing. Back to the Future Part II was released by Universal Pictures on November 22 , 1989 .. Universal Pictures. Universal Studios. Back to the Future. Back to the Future. The film received mixed reviews from critics and grossed over $ 331 million worldwide , making it the third-highest-grossing film of 1989 .. third-highest-grossing film of 1989. 1989 in film#Highest-grossing films
related.