Question: What Star Wars film does the Jedi master who Darth Bane appears as a vision first appear in?
Context: Star Wars: Darth Plagueis is a novel that is part of the "Star Wars" expanded universe.  It was written by James Luceno, and released on January 10, 2012.  The novel covers the later life and machinations of Sith lord Darth Plagueis, over a roughly fifty-year period pre-dating "Star Wars: The Phantom Menace".  The novel details Plagueis' overthrow of his own master Darth Tenebrous, his work as head of a powerful banking consortium on the Muun homeworld, his discovery, recruitment and training of the teenaged Sheev Palpatine of Naboo, and the efforts of Plagueis to undermine the Galactic Republic and ensure the dominance of the Dark Side of the Force.  The novel brings in scores of characters and locations already familiar in the "Star Wars" mythos, as well as introducing many others for the first time.  Events depicted on-screen in "Star Wars Episode I: The Phantom Menace", are re-told in "Star Wars: Darth Plagueis", often from a perspective not shown in the 1999 motion picture. Star Wars: Yoda Stories is a 1997 adventure video game based on the "Star Wars" franchise developed by LucasArts.  It was preceded by "Indiana Jones and His Desktop Adventures".  In the "Star Wars" timeline, "Yoda Stories" is placed between "The Empire Strikes Back" and "Return of the Jedi", where Luke Skywalker is completing his training with Jedi Master Yoda. Yoda is a fictional character in the "Star Wars" franchise created by George Lucas, first appearing in the 1980 film "The Empire Strikes Back".  In the original films, he trains Luke Skywalker to fight against the Galactic Empire.  In the prequel films, he serves as the Grand Master of the Jedi Order and as a high-ranking general of Clone Troopers in the Clone Wars.  Following his death in "Return of the Jedi" at the age of 900, Yoda was the oldest living character in the "Star Wars" franchise in canon, until the introduction of Maz Kanata in "". Luke Skywalker is a fictional character and the main protagonist of the original film trilogy of the "Star Wars" franchise created by George Lucas.  The character, portrayed by Mark Hamill, is an important figure in the Rebel Alliance's struggle against the Galactic Empire.  He is the twin brother of Rebellion leader Princess Leia Organa of Alderaan, a friend and brother-in-law of smuggler Han Solo, an apprentice to Jedi Masters Obi-Wan "Ben" Kenobi and Yoda, the son of fallen Jedi Anakin Skywalker (Darth Vader) and Queen of Naboo/Republic Senator Padmé Amidala and maternal uncle of Kylo Ren / Ben Solo.  The now non-canon "Star Wars" expanded universe depicts him as a powerful Jedi Master, husband of Mara Jade, the father of Ben Skywalker and maternal uncle of Jaina, Jacen and Anakin Solo. Darth Bane: Rule of Two, the sequel to the novel "", is part of the "Star Wars" expanded universe.  It was written by Drew Karpyshyn, and was released on December 26, 2007.  The novel centers on the young Sith apprentice Darth Zannah, recently taken under the wing of the Sith Lord Darth Bane.  The "Rule of Two" of the title refers to the rule that there be only two Sith in existence at one time: a Master and an Apprentice, a rule that Bane originates. Star Wars (later retitled Star Wars: Episode IV – A New Hope) is a 1977 American epic space opera film written and directed by George Lucas.  It is the first film in the original "Star Wars" trilogy, the first "Star Wars" movie in general, and the beginning of the "Star Wars" franchise.  Starring Mark Hamill, Harrison Ford, Carrie Fisher, Peter Cushing, Alec Guinness, David Prowse, James Earl Jones, Anthony Daniels, Kenny Baker, and Peter Mayhew, the film's plot focuses on the Rebel Alliance, led by Princess Leia (Fisher), and its attempt to destroy the Galactic Empire's space station, the Death Star.  This conflict disrupts the isolated life of farmhand Luke Skywalker (Hamill), who inadvertently acquires a pair of droids that possess stolen architectural plans for the Death Star.  When the Empire begins a destructive search for the missing droids, Skywalker accompanies Jedi Master Obi-Wan Kenobi (Guinness) on a mission to return the plans to the Rebel Alliance and rescue Leia from her imprisonment by the Empire. Admiral Firmus Piett is a fictional character from the "Star Wars" franchise, first introduced and portrayed by Kenneth Colley in the 1980 film "The Empire Strikes Back".  As a supporting villain in command of Darth Vader's flagship, "Executor", Piett is generally considered to be the most prominent Imperial officer in the film.  He subsequently appeared in the sequel "Return of the Jedi", making him the only officer in the original trilogy to appear in more than one film and be portrayed by the same actor.  Piett also appears in the canon "Star Wars" novel "", and is featured in several more novels, comic books, and video games within the "Star Wars Legends" line. "Star Wars" Weekends was a festival held annually at the Disney's Hollywood Studios theme park of the Walt Disney World Resort.  Included with park admission, the event typically occurred on Friday, Saturday and Sunday for four consecutive weekends in May and June and featured appearances by cast and crew members from Disney's "Star Wars" franchise created by George Lucas.  Many original Disney characters also appeared dressed as "Star Wars" characters, such as Jedi Mickey, Minnie as Leia, Donald as a stormtrooper, Goofy as Darth Vader and R2-MK (Mickey Mouse stylized astromech droid).  The festival began in 1997 and had been held in 2000, 2001, and annually from 2003 until 2015.  In November 2015, Disney discontinued the event due to construction of a "Star Wars" themed-land and the larger daily presence "Star Wars" will have in the park onwards. Starkiller, born Galen Marek and also known as The Apprentice, is the Dark Jedi anti-hero protagonist of the "" project.  In 2014, Lucasfilm rebranded him as part of the "Star Wars Legends" non-canonical story-line, and the character has not been re-introduced yet into the "Star Wars" canon.  He is raised by Darth Vader and is made his secret apprentice under the name "Starkiller" due to being potent with using the Force for destructive purposes and described as less of an assassin and more of a "Force wrecking ball".  The character's name is taken from Luke Skywalker's original name, "Annikin Starkiller".  The character's likeness and voice are provided by Samuel Witwer.  Despite "The Force Unleashed" being of non-canonical "Legends" status, Witwer still remains part of the "Star Wars" canon by voicing Darth Maul in the animated series "Star Wars: The Clone Wars" and "Star Wars Rebels". Darth Bane is a fictional character in the "Star Wars" franchise.  He was created by George Lucas, within the "Star Wars" canon where he is first mentioned in the novelization of "", where Bane is an ancient Sith Lord who lived a thousand years before the films, and is known for being the originator of the "Rule of Two" that the Sith Lords follow, which establishes: "A master and an apprentice can be the only Sith in the galaxy at one time", which still remains as his backstory.  Darth Bane's only on-screen appearance happens when he appears as a vision to Jedi master Yoda, in the last episode of the animated series "", he was voiced by Mark Hamill (who portrays Luke Skywalker in the films).
Answer: The Empire Strikes Back