Avengers Assemble is an American animated television series based on the fictional Marvel Comics superhero team known as the Avengers.
 Designed to capitalize on the success of the 2012 film, "The Avengers", the series premiered on Disney XD on May 26, 2013, as the successor to "".
Yūki Kaji (梶 裕貴 , Kaji Yūki , born September 3, 1985) is a Japanese voice actor and singer affiliated with the agency VIMS.
 He has voiced many notable roles such as Eren Yeager in "Attack on Titan", Shu Ouma in "Guilty Crown", Alibaba in "", Issei Hyodo in "High School DxD", Meliodas in "The Seven Deadly Sins", Yukine in "Noragami", Speed-O'Sound Sonic in "One-Punch Man" and Kanato Sakamaki, in "Diabolik Lovers".
 He was part of the four-unit singing group which was part of the "Goulart Knights" project, and has acted as one of the main protagonists in the movie "Kami Voice: The Voice Makes a Miracle".
 He won the Best Rookie Actor Award in the 3rd Seiyu Awards in 2009 and marked the first voice actor in Japan to win the Best Voice Actor Award two years consecutively in the 7th Seiyu Awards and 8th Seiyu Awards in 2013 and 2014.
 He has also been hosting the web radio show Yūki Kaji's Monologue (梶裕貴のひとりごと Kaji Yūki no Hitorigoto) since March 2014.
Johnny Murray was an American voice actor.
 Before 1929, he was a cornetist at the Cocoanut Grove.
 In 1929, he was under a contract with First National Pictures to sing for Richard Barthelmess in his films; he provided Barthelmess's voice in "Weary River".
 He is most famous today for his role as Bosko, the first star of Warner Brothers cartoons.
 He was the voice actor for Bosko in the 1933 short, "Bosko's Picture Show".
 This cartoon is infamous for perhaps containing the first cartoon depiction of Adolf Hitler, and possibly of being among the first, if not first, widely distributed films that contain verbal usage of the f-bomb.
 If that is the case, Murray is the first person to use the f-bomb in Hollywood cinema.
Hiroki Tōchi (東地 宏樹 , Tōchi Hiroki , born May 26, 1966, Tokyo) is a Japanese voice actor affiliated with Office Osawa.
 He has frequently appeared in many anime and video games mainly created by tri-Ace.
 He won a Male Character Voice Prize in the 2011 Famitsu Awards.
 Some of his major characters include Abel Nightroad in "Trinity Blood", Baldroy in "Black Butler", Kokopelli in "Bokurano", Tesshin Kataoka in "Ace of Diamond", Cross Marian in "D.Gray-man", Pantherlily in "Fairy Tail" and Lasse Aeon in "Mobile Suit Gundam 00".
 In anime film series, he voices Daisuke Akimi in "The Garden of Sinners" and Dr. Easter in "Mardock Scramble".
 In live-action shows, he provides the Japanese voice for Dean Winchester in "Supernatural" as well as in its anime adaptation.
 In video games, he voices the Japanese dub voice for Nathan Drake in "Uncharted" series, Chris Redfield in "Resident Evil" and "Project X Zone", Aluze in "Valkyrie Profile" and Desmond Miles in "Assassin's Creed".
Matthew Géczy (born August 23, 1964 in the state of Georgia) is an American movie and television actor, voice actor and voice director based in Paris, France.
 He has acted in several films for television and cinema, with directors such as Brian De Palma and Thomas Vinterberg.
 He has been a voice actor in advertising campaigns, documentaries, video games, internet media and in the field of animation.
 He has provided voices for productions such as "Code Lyoko", "Casper's Scare School", "Ratatouille", and "Persepolis".
 He played a voice acting role in video games such as "Rayman 2", "", "XIII" and "Amy".
 He has also worked as the voice director for numerous animated television series including the Children's BAFTA-nominated series "Eliot Kid" (BBC, ABC Australia, Cartoon Network), "Mouk" (Disney Junior), "I.N.K. Invisible Network of Kids" (Pop, ABC Australia), Season 2 of "Casper's Scare School", and is currently in production for Season 2 of "The Mysterious Cities of Gold" and "The New Adventures of Lassie" for DreamWorks Classics.
Paul Eiding (born March 28, 1957) is an American voice actor, voice instructor, and actor, perhaps best known as the voice actor behind Perceptor in the original Transformers cartoon, Colonel Roy Campbell in the "Metal Gear" series, the narrator in "Diablo", Judicator Aldaris in "StarCraft", and Max Tennyson in "Ben 10", "", "", and "Ben 10 Omniverse" where he also did the vocal effects for Zed, Liam and voices for several other characters.
 He is also the Vault Tec Rep from "Fallout 4".
Bill Braudis is a writer, voice actor and script writing instructor from Boston, Massachusetts who has also done stand-up comedy.
 He started in stand-up in 1981, doing open mics at The Comedy Connection, in Boston and the Ding Ho, in Cambridge.
 A little over a decade later, Braudis made his first of 3 appearances on The Tonight Show, with Jay Leno, which were soon followed up by two appearances on "Late Night with Conan O'Brien."
 Braudis has appeared in several Soup2Nuts programs, voicing the "amiable twit," Doug Savage in "Science Court" as well as voicing "Bill," in "Hey Monie!
".
 Braudis also appeared in the first episode of "Dr. Katz, Professional Therapist" and played "Dr. Meyers" on "O'Grady".
 Braudis wrote for the award-winning "Dr. Katz: Professional Therapist," the award-winning "Science Court," and the venerable Soup2Nuts series that ran on Cartoon Network "Home Movies."
 He also wrote for "Raising Dad," a short-lived sitcom on the WB Network, starring Bob Saget, Kat Dennings, Brie Larson and Jerry Adler.
 Braudis did a short stint on the Adult Swim's Death Metal cartoon, "Metalocalypse" thanks to his friend, Brendon Small and writer Tommy Blacha.
Michael Henry (born March 25, 1964) is an American actor, voice actor, writer, producer, comedian, and singer, best known for his work on "Family Guy", where he is a writer, producer, and voice actor.
 He provides the voices for many characters including Cleveland Brown, Herbert, Bruce, and Consuela.
 Starting with the series' 5th season, Henry had received billing as a main cast member.
 In 2009, Henry, Richard Appel, and Seth MacFarlane created a spin-off of "Family Guy" called "The Cleveland Show", to focus on Cleveland and his new family, which aired on FOX until the show's final new episode (due to cancellation) on May 19th, 2013.
 Reruns of the show later aired on Cartoon Network's Adult Swim.
Johan Hedenberg (born 9 October 1954) is a Swedish actor and voice actor.
 Prior to becoming an actor he worked as a Prison Officer at Svartsjö Anstalten (Blacklake penitentiary).
 As a child, he was beaten by his father until his late teens, when he physically assaulted him.
 After the attack, Hedenberg's father never touched him again but their relationship became very frosty.
 In the 1980s, he spent much time in the company of Thorsten Flinck and Paolo Roberto.
 In 1984, after getting into a fight, he lost his job at Dramaten.
 He soon found work in various TV-series and at the end of the 80's found work in the emerging business of voice acting.
 With the introduction of commercial television in Sweden, animated shows on TV became more common and Hedenberg found steady work as a voice actor which he still benefits from.
 As a voice actor, Johan Hedenberg became a popular choice to cast as villains because of his deep voice.
 He has provided the Swedish voice for several famous cartoon villains such as Dr. Julian Robotnik, Prolix, The Shredder, Dr. Drakken and Dick Dastardly.
 In 2012, Hedenberg miracoulosly survived an operation to remove a tumor from his heart which was at high risk at spreading.
 Hedenberg says that the incident gave him new perspectives on life.
 He has two daughters from a previous marriage.
Liam Christopher O'Brien (born May 28, 1976) is an American voice actor, writer and voice director in the Los Angeles area.
 He has been involved in many English-language adaptations of Japanese anime, and is also a regular in numerous video games and cartoons.
 His major anime roles include Gaara in "Naruto", Captain Jushiro Ukitake in "Bleach", Lloyd in "Code Geass", and Kenzo Tenma in "Monster".
 In cartoons, he voices in shows such as "Star Wars Rebels", "", "Avengers Assemble", "Wolverine and the X-Men", and "Hulk and the Agents of S.M.A.S.H.".
 In video games, he voiced Gollum in "", Caius Ballad in "Final Fantasy XIII-2", War in "Darksiders", Asura in "Asura's Wrath", Illidan Stormrage in "World of Warcraft", and the Warden in "For Honor".
 He has directed for "Naruto", "The Last of Us", "Evolve", "Resident Evil 5", and "Resident Evil 6".

Question: Which cartoon premiering on May 26, 2013 features Liam O'Brien as a voice actor.
Answer: Avengers Assemble