Question: What 2013 superhero film did Christopher Townsend work on?

full_context: Document 1: Visual effects supervisor: In the context of film and television production, a visual effects supervisor is responsible for achieving the creative aims of the director and/or producers through the use of visual effects. While it is a creative role, most supervisors possess a strong technical background and are capable of making informed decisions about the most efficient and effective technique to employ to solve the problem at hand. Often a supervisor will work in tandem with a visual effects producer and computer graphics supervisor.
Document 2: Iron Man (2008 film): Iron Man is a 2008 American superhero film based on the Marvel Comics character of the same name, produced by Marvel Studios and distributed by Paramount Pictures. It is the first film in the Marvel Cinematic Universe. The film was directed by Jon Favreau, with a screenplay by the writing teams of Mark Fergus and Hawk Ostby and Art Marcum and Matt Holloway. It stars Robert Downey Jr., Terrence Howard, Jeff Bridges, Shaun Toub, and Gwyneth Paltrow. In "Iron Man", Tony Stark, an industrialist and master engineer, builds a powered exoskeleton and becomes the technologically advanced superhero Iron Man.
Document 3: Vincent Cirelli: Vincent Cirelli is a special effects supervisor. Known for his works at Luma Pictures as a visual effects supervisor in acclaimed films such as "" (2007), "No Country for Old Men" (2007), "The Midnight Meat Train" (2008), "" (2008), "Harry Potter and the Half-Blood Prince" (2009), "The Book of Eli" (2010), "" (2011), "" (2012), "Prometheus" (2012), "The Avengers" (2012), "Saving Mr. Banks" (2013), "Guardians of the Galaxy" (2014), "" (2015), "In the Heart of the Sea" (2015), "Deadpool" (2015) and "Doctor Strange" (2016), for which he received an Academy Award for Best Visual Effects nomination at the 89th Academy Awards.
Document 4: Captain America: Civil War: Captain America: Civil War is a 2016 American superhero film based on the Marvel Comics character Captain America, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. It is the sequel to 2011's "" and 2014's "", and the thirteenth film of the Marvel Cinematic Universe (MCU). The film is directed by Anthony and Joe Russo, with a screenplay by Christopher Markus & Stephen McFeely, and features an ensemble cast, including Chris Evans, Robert Downey Jr., Scarlett Johansson, Sebastian Stan, Anthony Mackie, Don Cheadle, Jeremy Renner, Chadwick Boseman, Paul Bettany, Elizabeth Olsen, Paul Rudd, Emily VanCamp, Tom Holland, Frank Grillo, William Hurt, and Daniel Brühl. In "Captain America: Civil War", disagreement over international oversight of the Avengers fractures them into opposing factions—one led by Steve Rogers and the other by Tony Stark.
Document 5: Iron Man 3: Iron Man 3 (stylized onscreen as Iron Man Three) is a 2013 American superhero film based on the Marvel Comics character Iron Man, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. It is the sequel to 2008's "Iron Man" and 2010's "Iron Man 2", and the seventh film in the Marvel Cinematic Universe. Shane Black directed a screenplay he co-wrote with Drew Pearce, which uses concepts from the "Extremis" story arc by Warren Ellis. The film stars Robert Downey Jr., Gwyneth Paltrow, Don Cheadle, Guy Pearce, Rebecca Hall, Stephanie Szostak, James Badge Dale, Jon Favreau, and Ben Kingsley. In "Iron Man 3", Tony Stark deals with posttraumatic stress disorder caused by the events of "The Avengers", while investigating the reemergence of the Ten Rings, led by the mysterious Mandarin and comes into a conflict with an old enemy: Aldrich Killian.
Document 6: Avengers: Infinity War: Avengers: Infinity War is an upcoming American superhero film based on the Marvel Comics superhero team the Avengers, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. It is intended to be the sequel to 2012's "Marvel's The Avengers" and 2015's "" and the nineteenth film installment in the Marvel Cinematic Universe (MCU). The film is directed by Anthony and Joe Russo, with a screenplay by Christopher Markus & Stephen McFeely, and features an ensemble cast that includes Robert Downey Jr., Josh Brolin, Mark Ruffalo, Tom Hiddleston, Chris Evans, Chris Hemsworth, Jeremy Renner, Chris Pratt, Elizabeth Olsen, Sebastian Stan, Benedict Cumberbatch, Paul Bettany, Cobie Smulders, Benedict Wong, Zoe Saldana, Karen Gillan, Vin Diesel, Dave Bautista, Bradley Cooper, Pom Klementieff, Scarlett Johansson, Benicio del Toro, Tom Holland, Anthony Mackie, Chadwick Boseman, Danai Gurira, Paul Rudd, and Don Cheadle. In "Avengers: Infinity War", the Avengers join forces with the Guardians of the Galaxy to confront Thanos, who is trying to amass the Infinity Stones.
Document 7: Iron Man 2: Iron Man 2 is a 2010 American superhero film based on the Marvel Comics character Iron Man, produced by Marvel Studios and distributed by Paramount Pictures. It is the sequel to 2008's "Iron Man", and is the third film in the Marvel Cinematic Universe. Directed by Jon Favreau and written by Justin Theroux, the film stars Robert Downey Jr., Gwyneth Paltrow, Don Cheadle, Scarlett Johansson, Sam Rockwell, Mickey Rourke, and Samuel L. Jackson. Six months after the events of "Iron Man", Tony Stark is resisting calls by the United States government to hand over the Iron Man technology while also combating his declining health from the arc reactor in his chest. Meanwhile, rogue Russian scientist Ivan Vanko has developed the same technology and built weapons of his own in order to pursue a vendetta against the Stark family, in the process joining forces with Stark's business rival, Justin Hammer.
Document 8: Joe Letteri: Joe Letteri, ONZM (born 1957) is a senior visual effects artist, winner of four Academy awards, four BAFTA awards and four VES awards. He is the current Director of the Academy Award-winning Weta Digital, having joined the company in 2001. He has received several awards and nominations as visual effects supervisor, the latest (as of January 2015 ) being "Dawn of the Planet of the Apes". He attended Center High School (Pennsylvania) in 1975 and graduated from the University of California, Berkeley in 1981. He gave the keynote address at UC Berkeley's December Convocation on December 19, 2010.
Document 9: Christopher Townsend: Christopher Townsend is a visual effects supervisor. He has worked in the visual effects industry for over 20 years. For over a decade, he was an artist and supervisor at Industrial Light and Magic, and in 2007 became a freelance visual effects supervisor. He worked on "Journey to the Center of the Earth", the first ever stereoscopic motion picture shot and released digitally, "Wolverine", "Ninja Assassin", "" and "". He was nominated for a BAFTA and an Academy Award for Best Visual Effects for his work on "Iron Man 3", oversaw nearly 3000 shots on "" and was the overall supervisor for "Guardians of the Galaxy Vol. 2". In 2015 he was given an Honorary Doctor of Arts degree by his alma mater, Coventry University.
Document 10: Paul Franklin (visual effects supervisor): Paul J. Franklin is an English visual effects supervisor who has worked with visual effects since the 1990s. He is known for his long-running working relationship with director Christopher Nolan which dates back to "Batman Begins" (2005). Franklin won the Academy Award for Best Visual Effects and the BAFTA Award for Best Special Visual Effects for "Inception" (2010), and won a second Academy Award for Best Visual Effects for "Interstellar" (2014). He shared the wins with Andrew Lockley, Peter Bebb, and Chris Corbould. Franklin has also been nominated for an Academy Award for "The Dark Knight" (2008). He was nominated for BAFTA Awards for "Batman Begins", "The Dark Knight" (2008), and "The Dark Knight Rises" (2012).
Document 11: Avengers: Age of Ultron: Avengers: Age of Ultron is a 2015 American superhero film based on the Marvel Comics superhero team the Avengers, produced by Marvel Studios and distributed by Walt Disney Studios Motion Pictures. It is the sequel to 2012's "The Avengers" and the eleventh film in the Marvel Cinematic Universe (MCU). The film was written and directed by Joss Whedon and features an ensemble cast that includes Robert Downey Jr., Chris Hemsworth, Mark Ruffalo, Chris Evans, Scarlett Johansson, Jeremy Renner, Don Cheadle, Aaron Taylor-Johnson, Elizabeth Olsen, Paul Bettany, Cobie Smulders, Anthony Mackie, Hayley Atwell, Idris Elba, Stellan Skarsgård, James Spader, and Samuel L. Jackson. In "Avengers: Age of Ultron", the Avengers fight Ultron, an artificial intelligence obsessed with causing human extinction.
Document 12: R. Christopher White: R. Christopher White is a two time Academy Award nominated visual effects artist.
Document 13: Greg Butler (visual effects supervisor): Gregory S. Butler (August 18, 1971, Suffield, Connecticut) is a visual effects supervisor. He graduated from Suffield High School in 1989 and afterwards entered Hampshire College. Despite his initial plans to study history, a work-study job with the audiovisual equipment in the library made him interested in film production. Butler graduated in 1993 with a major in film, television and theater design. Afterwards he moved to California to work for Industrial Light and Magic for 9 months, where after intern work he managed to become an assistant in the effects department, starting with assistant credits in "The Mask" and "Forrest Gump". Following a job at Rocket Science Games until the company's bankruptcy in 1996, Butler went to Tippett Studio and did effects work in "Starship Troopers" and "My Favorite Martian", rising up to a technical director job, and Cinesite for "Practical Magic". While reluctant at the requirement of moving to New Zealand, Butler was convinced by his writer-actor brother Jared to jump at the opportunity of working for Weta Digital in "The Lord of the Rings". His biggest achievement was working in the creation of Gollum. Butler also worked as a computer graphics supervisor on "I, Robot" before an invitation to work as an effects supervisor for the Moving Picture Company, in London. He continues on MPC, but is now on the Vancouver office. On January 24, 2012, he was nominated for an Academy Award for "".
Document 14: Chris Corbould: Christopher Charles Corbould, {'1': ", '2': ", '3': ", '4': "} (born 1958) is a British special effects coordinator best known for his work on major blockbuster films and the action scenes on some 11 "James Bond" films since the early 1980s. He has also worked extensively on the "Superman" and "Batman" film series on digital effects and stunts. Corbould has been awarded two Honorary Doctorates from Southampton Solent University in December 2009 and University of Hertfordshire in 2011. In 2011, he won the Academy Award for Best Visual Effects at the 83rd Academy Awards for his work on "Inception". He is the brother of special effects supervisors Neil Corbould and Paul Corbould.
Document 15: Trevor Slattery: Trevor Slattery is a character portrayed by Ben Kingsley in the films of the Marvel Cinematic Universe (MCU). An actor hired to portray the legendary terrorist the Mandarin, he first appeared in the 2013 film "Iron Man 3". General response to the character was mixed, with many comic fans criticizing the character and how his reveal affected the film's Mandarin portrayal, while others defended the twist as "brilliant" and "satisfying", noting its social commentary and how it avoided the racist caricature of the comics' Mandarin. Kingsley reprised the role in "All Hail the King", a 2014 Marvel One-Shot short film also set in the MCU.
ground_truth: Iron Man 3