Question: Which Billy Dee Williams character did Grand Admiral Thrawn face off again?

Context paragraphs:
Grand Admiral Thrawn: Grand Admiral Thrawn (full name Mitth'raw'nuruodo) is a fictional character in the "Star Wars" franchise.  Introduced in the 1991 Timothy Zahn novel "Heir to the Empire", he is an Imperial military commander who has taken control of the Galactic Empire's remaining forces five years after the events of the 1983 film "Return of the Jedi".  Thrawn faces off against classic "Star Wars" characters Luke Skywalker, Princess Leia, Han Solo, Chewbacca, and Lando Calrissian in the "Thrawn" trilogy (1991–1993), but is ultimately defeated.  He is seemingly resurrected in the "Hand of Thrawn" duology (1997–98), and his backstory is explored in various other novels, short stories, comics, and video games in the "Star Wars" Expanded Universe.

Thrawn trilogy: The Thrawn" trilogy, also known as the Heir to the Empire" trilogy, is a series of best-selling science fiction novels written by Timothy Zahn.  They are set in the "Star Wars" expanded universe approximately five years after the events depicted in the 1983 "Star Wars" film "Return of the Jedi".  The series introduced several notable characters, including Mara Jade, Talon Karrde, and Grand Admiral Thrawn, one of the more notable villains in the expanded universe.  The "Thrawn" trilogy was followed by "The Hand of Thrawn", a two-book series (1997 and 1998) also authored by Zahn.

Lando Calrissian: Lando Calrissian is a fictional character in the "Star Wars" franchise.  He is portrayed by Billy Dee Williams in "The Empire Strikes Back" and "Return of the Jedi", and will be played by Donald Glover in the upcoming Han Solo standalone film.  He also appears frequently in the "Star Wars" expanded universe of novels, comic books and video games, including a series of novels in which he is the protagonist.

Batman (1989 film): Batman is a 1989 American superhero film directed by Tim Burton and produced by Jon Peters and Peter Guber, based on the DC Comics character of the same name.  It is the first installment of Warner Bros.' initial "Batman" film series.  The film stars Michael Keaton as Bruce Wayne/Batman and Jack Nicholson as The Joker, alongside Kim Basinger, Robert Wuhl, Pat Hingle, Billy Dee Williams, Michael Gough and Jack Palance.  The film takes place early in the title character's war on crime, and depicts a battle with his arch-nemesis the Joker.

Lars Mikkelsen: Lars Dittmann Mikkelsen (born (1964--)06 1964 ) is a Danish actor best known to international TV audiences for his roles as Copenhagen mayoral election candidate Troels Hartmann in the drama series "The Killing", Charles Augustus Magnussen, the primary villain in the third series of "Sherlock", the Russian President Viktor Petrov in "House of Cards" on Netflix, and Grand Admiral Thrawn in "Star Wars Rebels".  He is the older brother of actor Mads Mikkelsen.  In 2011 he won the Reumert Prize of honour.

Choices of One: Choices of One is a "Star Wars" novel written by Timothy Zahn, released by Del Rey Books on July 19, 2011.  The sequel to Zahn's 2007 novel "Allegiance", it is set between the events of the films "Star Wars: A New Hope" and "The Empire Strikes Back" and features Luke Skywalker, Princess Leia, Han Solo, Mara Jade, and the villain Grand Admiral Thrawn.

Barry Munday: Barry Munday (alternatively known as Family Jewels) is a 2010 American comedy film directed by Chris D'Arienzo; it is based on the novel "Life is a Strange Place" by Frank Turner Hollon.  The film stars Patrick Wilson as the title character, as well as Judy Greer, Malcolm McDowell, Chloë Sevigny, Cybill Shepherd, Billy Dee Williams, Emily Procter, Colin Hanks, Jean Smart, Mae Whitman, and Kyle Gass.  It premiered at the South by Southwest Film Festival in March 2010.  The film was released on October 1, 2010.

Billy Dee: "Not to be confused with Billy Dee Williams or Billy Dee Smith"

The Final Comedown: The Final Comedown is a 1972 blaxploitation drama film written, produced and directed by Oscar Williams and starring Billy Dee Williams and D'Urville Martin.  The film is an examination of racism in the United States and depicts a shootout between a radical black nationalist group and the police, with the backstory leading up to the shootout told through flashbacks.  The radical group is not identified by name in the film but closely resembles the Black Panther Party.

Star Wars: Thrawn: Star Wars: Thrawn (also known simply as Thrawn) is a "Star Wars" novel by Timothy Zahn, published on April 11, 2017 by Del Rey Books.  It chronicles the origins of Grand Admiral Thrawn, a popular character originating from the "Star Wars Legends" line of works, which were declared non-canon to the franchise after Lucasfilm redefined "Star Wars" continuity in April 2014.  The novel was announced in July 2016 alongside news that the character Thrawn would be reintroduced into the "Star Wars" franchise on the 3D CGI animated television series "Star Wars Rebels".

Supporting paragraphs: Grand Admiral Thrawn Lando Calrissian
Answer: Lando Calrissian